Showing posts with label safety. Show all posts
Showing posts with label safety. Show all posts

Friday, May 28, 2021

Southwire TRC 30 Amp GFCIs with Twist Lock Plugs

Southwire  TRC series 44700 and 44720 30 amp GFCIs 

See all of our ground fault circuit interrupters HERE!

30 amp GFCI IN-LINE Cord Sets with Manual Reset.

TRC 30 Amp GFCI's
44700 004-3, 44700 005-2
44720 012-3,  44720 013-2, 44720 020-1
 















Designed for rugged duty. Molded from high impact polymer with booted reset and test buttons. At home in hostile environments such as industrial, construction, maintenance and commercial work sites. Provides compliance with National Electric Code (NEC 2008) Article 590.6 for “Temporary Installations.” Rainproof rated, UL listed for outdoor use. Standard lengths:
2’, 6’, and 25’ with corresponding locking connectors. Custom cable gauges, lengths and terminations available by special order. To prevent unmonitored equipment startup, manual reset is required after GFCI trip and power outage.

44700 004-3 (2’)
44700 005-2 (6’)
• Volts/Amps: 120V/30A • Cord Gauge: 10/3 AWG • NEMA L5-30P & R
• Trip Level: 4 - 6 mA

Southwire's Technology Research Corporation (TRC) GFCI Inline Cord Sets 44700 (120V/30 A)  44720 (240V/30 A) are designed for rugged duty.  Plug and Receptacles are molded from high impact polymer with booted reset and test buttons.  The TRC 44700/44720 series are at home in hostile environments such as industrial, construction, maintenance and commercial work sites. Cord Gauge is 10/3 AWG for maximum strength and durability. Ideal for use by contractors and industrial maintenance personnel working with extension cords or portable tools.  Provides compliance with National Electric Code (NEC 2008) Article 590.6 for Temporary Installations. Applications include: High Pressure Sprayer Washers, Power Tools, Drain Snakes, Pumps, Construction Sites, Industrial Appliances. The TRC GFCI is Rainproof rated, UL listed for outdoor use.  Cord lengths are 2, 6 and 25 feet. The 120 version does not have a 25' length, only 2' and 6'.Voltage rating are 120 and 240 vac, amperage rating is 30, trip level is 4-6mA and has standard 120 or  240 volt NEMA L5 or L6-30 Black Plug & Receptacle. To prevent unmonitored equipment startup, manual reset is required after GFCI trips and power outages or when you unplug and plug back in.

44720 012-3 (3’)
44720 013-2 (6’)
44720 020-1 (25’)
• Volts/Amps: 240V/30A • Cord Gauge: 10/3 AWG • NEMA L6-30P & R

• Trip Level: 4 - 6 mA 

APPLICATIONS INCLUDE 

• High Pressure Sprayer Washers 

• Construction Site Power Tools 

• Drain Snakes

• Pumps

• Industrial Appliances 

• Construction Sites

GROUNDED NEUTRAL   

4 Ohms

TRIP RESPONSE TIME FOR GROUND FAULT 

AND GROUNDED NEUTRAL TRIP  

Less Than 25mS

VOLTAGE SURGE WITHSTAND     

3kv ringwave test and 4kv/2kA surge immunity test

RADIO FREQUENCY NOISE SUSCEPTIBILITY   

Operates Within Normal Limits With 0.5 Volts 

Injected On Power Line 150Khz-230Mhz

FREQUENCY   

60 Hz

ENDURANCE   

3,000 Operations Minimum

OVERLOAD CURRENT   

Six Times Rated Current

OPERATING TEMPERATURE RANGE  

 -35 ̊C to 66 ̊C

EFFECT OF 10 AMP TURN DC SHOCK FAULT TRIP     

5% Maximum Trip Level Variation on Ground 

INSULATION VOLTAGE   

1500 Vrms - 1 Min.

POWER ON INDICATION    

Lighted Indicator 


Anderson-Bolds sells TRC Ground Fault Circuit Interrupters 


Southwire TRC 120 volt 30 amp GFCIs

44700 004-3 (2’)
44700 005-2 (6’)

Southwire TRC 240 volt 30 amp GFCIs

44720 012-3 (3’)
44720 013-2 (6’)
44720 020-1 (25’)


Anderson-Bolds


GFCI...GFCI...GFCI...GFCI...GFCI

Tuesday, December 1, 2020

GFCI's and OSHA Violations

 GFCI Products to Remedy OSHA Violations

TRC GFCI 14650-006







An OSHA violation is a serious matter. Many of them can result in injury or death. Some violations are obvious and easy to spot while others require training and a comprehensive understanding of the requirements in order to detect them.

For example, improper Lockout/Tagout of energized equipment or machine guarding, although not simple, might be easier to notice and correct than electrical code violations that require a detailed understanding of the written rules and are likely to be unnoticed by many at the site.

Although most of the people understand basic electricity (e.g., not sticking metal objects into outlets,  it is still perceived as a very complicated topic.

However, not all electrical violations are complicated. Some basic OSHA-mandated safety requirements are very easy to spot and correct if one knows what to look for. Among the top ten most frequently cited standards violations for 2014-2015, electrical-related standards violations are number 8 and 10 on the list.


Top 10 Most Frequently Cited Standards violations for Fiscal 2015 (Oct. 1, 2014, to Sept. 30, 2015)

1.       Fall Protection (1926.501)

2.       Hazard Communication (1910.1200)

3.       Scaffolding (1926.451)

4.       Respiratory Protection (1910.134)

5.       Lockout/Tag Out (1910.147)

6.       Powered Industrial Trucks (1910.178)

7.       Ladders (1926.1053)

8.       Electrical – Wiring Methods (1910.305)

9.       Machine Guarding (1910.212)

10.     Electrical – General Requirements (1910.303)


Anderson-Bolds can help with Fall Protection, Lockout/Tag Out,

 Machine Guarding and Electrical (GFCIs).


30 Amp Inline GFCI with locking plugs





Now we are unlikely to be able to educate everyone on everything, but what we can achieve is to give some basic ideas on how these violations can be decreased and potentially save lives. If, as a result of this article, we save one life we could not be happier and it is sad to see people getting injured for something that is so easy to avoid.

So what exactly is so easy to fix? Use a work site Ground Fault Circuit Interrupter or GFCI for short! If you have employees working in a location that has temporary power, it is highly recommended to use a GFCI on every electrical circuit or service, even if there are no OSHA regulations requiring it.

For example , with the use of tools like wet vacs, power washers, wet saws or drills used to mix cement, it is a good practice to have GFCI’s installed to protect employees who work with this equipment. Per OSHA, all construction sites and construction site-like activities that use extension cords or certain equipment have to be GFCI protected2. As a rule of thumb, if you have power equipment outdoors, or near moisture/water you need to use GFCI-protected devices. OSHA estimates that since the GFCI requirement was implemented in 1970, the rule has saved more than 650 lives. That is one person a month since 1970!  

What is a GFCI? (Ground Fault Circuit Interrupter)

GFCI is an electrical device that measures the difference between output and input load current, opening whenever a difference is detected that could pose a safety hazard. If there is a current difference of more than 6 milliamps (mA), the GFCI unit will disconnect power to the load. Don’t be fooled into using a standard circuit breaker. Circuit breakers are designed to protect equipment not people!

GFCI’s come in a variety of forms and shapes, but for MRO or construction industries, the two most common options are right angle plug adapters or corded GFCIs that have a power cord and multiple output sockets. Each type might come with various additional features, especially the corded models. Corded models can offer different cord lengths from 2 ft up to 100 ft long, and also illuminated outlets and various socket configurations.

Something to remember is that socket multipliers and surge protectors are not the same as a Ground Fault Circuit Interrupter or GFCI for short. A GFCI is the only device designed specifically to protect people, whereas everything else is designed to protect equipment from damage due to high voltage transients. This is important to remember in order to choose the appropriate device for its intended application. If you have a device and you want to protect equipment from damaging power transients, then use a surge protector. However, if your primary concern is to protect employees, a GFCI is the only product capable of doing it.

A properly designed and manufactured GFCI unit will continue to provide protection when hazardous wiring conditions present. For example mis-wiring the neutral wire and a hot wire at the circuit breaker or outlet will not impede the GFCI’s ability to offer protection.

There are certain circumstances when a GFCI might not prevent a shock, such as when a person touches  both electric wires at the same time, offering a path from one wire in through one hand, through the body, and out on the other hand to the other electric wire. In this situation the GFCI will not sense a current imbalance and will not trip. This is a very important point to consider when training personnel working on equipment with GFCIs.

GFCI’s are intended to trip if current is passing through a path to ground; this could be from a tool or piece of equipment through the user. The GFCI is intended to trip quickly, so the user is not harmed.

It should be noted that a shock can be felt even with a GFCI, but the GFCI will trip quickly enough to avoid an injury.

When looking for a GFCI something to keep in mind is the design of the product. Although there are a lot of products available on the market, the most reliable products carry a UL approval. UL is the leading safety organization with best test and follow up practices. This ensures products are produced with safety critical aspects continually tested and validated in the factory. You might find some products that are few dollars cheaper, but do not carry UL approval and they may perform just as well. The key here is “may”. Products that have UL approval have undergone the most rigorous testing and follow up inspection, and so it should be the “product of choice” when personnel safety is important.

Having several of the GFCI products in your department is just as easy as having many extension cords. GFCI’s become second nature once employees are trained to use them. No one wants to get electrocuted or injured. It is very easy to use them and highly effective in any environment!

TRC HD-Pro 24646-001 30 Amp Unit










Repeating: What is a GFCI

A ground-fault occurs when there is a break in the low-resistance grounding path from a tool or electrical system. The electrical current may then take an alternative path to the ground through the user, resulting in serious injuries or death. The ground-fault circuit interrupter, or GFCI, is a fast-acting circuit breaker designed to shut off electric power in the event of a ground-fault within as little as 1/40 of a second. It works by comparing the amount of current going to and returning from equipment along the circuit conductors. When the amount going differs from the amount returning by approximately 5 milliamperes, the GFCI interrupts the current.

The GFCI is rated to trip quickly enough to prevent an electrical incident. If it is properly installed and maintained, this will happen as soon as the faulty tool is plugged in. If the grounding conductor is not intact or of low-impedance, the GFCI may not trip until a person provides a path. In this case, the person will receive a shock, but the GFCI should trip so quickly that the shock will not be harmful.

The GFCI will not protect you from line contact hazards (i.e. a person holding two "hot" wires, a hot and a neutral wire in each hand, or contacting an overhead power line). However, it protects against the most common form of electrical shock hazard, the ground-fault. It also protects against fires, overheating, and destruction of wire insulation.

View Anderson-Bolds Safety Equipment HERE!

Anderson-Bolds
216-360-9800
www.anderson-bolds.com

GFCI...GFCI...GFCI...GFCI...GFCI...GFCI...GFCI...GFCI

Saturday, December 15, 2018

Sure-Foot Stair Treads for Worker Safety

Sure-Foot Stair Treads from Anderson-Bolds

Fiberglass FRP Step Covers Improve Worker Safety


Problem: 

Outdoor Stairway Poses High Slip-and-Fall Risk to Employees 




Worker safety is a key responsibility for any employer, but even more so in the manufacturing industry. Whether they are clocked-in, on a break or headed home, employee care is a top priority for building design and maintenance.  
When the safety management team at an aerospace company became concerned about a set of outdoor stairs used by staff, they began to research preventative solutions.  
With an estimated 130+ workers using these steps each day, the stairway began to show signs of wear. The metal, open-grated steps were rusting in areas where the paint had chipped. Exposed to the elements, the stairs would often get wet and slick in the inclement weather.   
Taking a proactive approach, the manufacturer reached out to Sure-Foot, seeking an anti-slip solution that would allow their workers to navigate the stairway securely in all types of weather.  



Solution: 

Flexible Fiberglass Step Covers Eliminate Hazardous Stairway Conditions 



Sure-Foot first walked through a discovery process with the manufacturer, collecting facts on the potential project. After assessing the data, including the stairway location, step dimensions, traffic type and traffic volume, the Sure-Foot team recommended the best solution.  
Based on the customer’s information, Sure-Foot suggested its Fiberglass FRP step covers with landing panels located in the middle and at the top of the stairwell. The product used was the 11.75” anti-slip step cover in a medium grit with a yellow nose and a black back.   
Our fiberglass product was the best choice for this application because metal stair covers are too rigid, and rubber isn't suited for long-term use in outdoor environments. The flexibility of these fiberglass step covers allows them to flex with the open grated steps, making them the perfect solution in this case.  

Implementation

Designing Custom Anti-Slip, Fiberglass Step Covers


Sure-Foot’s non-slip fiberglass FRP step covers are created to handle the elements no matter the amount of foot traffic.  
A custom fiberglass solution was created to the exact specifications of the 27-step stairwell. The step cover design featured a yellow nose to call attention to the steps edge. The solution was delivered to the facility ready for installation using bolt grate clips for fastening.  

Results

Non-Slip Stairway Solution Offers Quick and Easy Installation for Customer


The customer was thrilled with the ease and speed of installation, providing before and after photos to show the incredible improvement.  
The brightly colored yellow edge allows for a better level of safety as employees quickly use the steps to come and go from the facility. The grit step covers now provide better grip and footing for workers even during poor weather conditions.

Buy Sure-Foot Treads HERE!

Anderson-Bolds
216-360-9800

Sure-Foot Stair Treads and Safety Tape for Slip and Fall prevention on Side walks, Walkways, Staircases, Ladders, Step Stools. 

Saturday, April 30, 2016

TRC Southwire High Power 100 Amp GFCI - ELCI

Anderson-Bolds sells TRC / Southwire GFCI's and ELCI's up to 100 AMPS.

These are the  new Southwire TRC 24736-001 and 24994-001 100 amp 6-10-30 Trip Level GFCI and ELCI Units.

Anderson-Bolds is your source for Commercial safety products including GFCIs and ELCIs.

GFCIs and ELCIs are used for personnel and equipment protection.


TRC has engineered a new option for the HD-PROTM series called 6.10.30TM.
Configured for both in-line and bulk head mount. This unique new design allows the user to select and lock in the most sensitive trip level at which a specific type of equipment can be operated without nuisance tripping. Adjustable settings
include trip levels for 6mA, 10mA and 30mA. Trip level flexibility to meet your needs in one single device - HD-PROTM with 6.10.30TM.  6.10.30TM key enables trip level selection and locking at a trip level with key removal.  

The GFCIs protect Motors, Pumps, Pressure Washers, Conveyors, Welders and lifts.

Go To GFCI/ELCI Store Page HERE. or call 216-360-9800


TRC 24736-001 and TRC 24994-001
100 amp GFCI/ELCI





















Specifications:

Voltage:  480 or 600 volts AC and three phase
AMPS: 100
Cord Gauge: 2/4 AWG
Trip Levels: 6mA, 10mA, 30mA - chosen by Key Switch
GFCI Response Time: 25mS
Frequency: 50/60 Hz
Endurance: 3,000 operations minimum
Overload Current: SIX times rated current
Temperature Range: -20C to +40C
Power n Indicator: Light
Drop Out Voltage: About 60% rated voltage
Reset Type: Auto
Connection: Flying Leads
Enclosure: NEMA 4 Polymer



216-360-9800
www.anderson-bolds.com





Wednesday, February 10, 2016

Process Ovens Over 40 years Old


Safety Updates for Older Ovens.

 

Most Process ovens made over 40 years ago did not include an excess temperature controller or separate heating element contactors to protect the oven from overheating if the main temperature controller or contactors fail. 
 Any ovens like this should not be used until this safety equipment is installed.  Failure to install this safety equipment could result in the oven overheating and a fire that could result in oven damage, loss of the product load, building damage and injury to personnel.
 

A field kit to add the excess temperature controller and separate contractors should be ordered from the MFG.

The excess temperature controller and separate contactors are now standard equipment on all Grieve ovens.  Also standard is a recirculating blower airflow safety switch to shut down the oven heat if the recirculating blower fails.  This is a pressure differential switch that senses the pressure created when the blower wheel is turning.  This switch protects the oven heating elements by preventing them from heating when air is not being recirculated over them.  A field kit for installation of the recirculating blower airflow safety switch should be purchased from the oven MFG.


When installing new safety equipment it can be a good idea to add other new electronics to the oven for better performance.  New electronics could be a digital temperature controller, programmable digital temperature controller, new thermocouples or a digital timer.  Grieve can provide a field kit to add a digital temperature controllers as well as and a field kit for a digital shut down timer. For electric Ovens new elements can be ordered as well along with pin and sleeve disconnect switches for added electrical safety for personnel. We can provide Gas meters for gas ovens to measure gas flow at the oven and shut the oven down in a dangerous situation.

Grieve's field kits include installation instructions, wiring diagram showing items to be removed, wiring diagram showing items to be added and revised wiring diagram for your records.  Our kits will be based on how the ovens were constructed when they left our factory.  If there have been changes made to the oven in the field they will not be included in our revised wiring diagram.   


Grieve will provide all parts except for standard wire, conduit and conduit fittings.  These items are better provided in the field as necessary to connect the components being added.  Conduit would only be required for the air flow safety switch as the other items are mounted in the oven control panel.

Please contact Anderson-Bolds with the oven serial number, job # and model number all of which can be found on the name plate of the oven.  We can also provide new wiring schematics for old ovens and instruction manuals.  Grieve and Anderson-Bolds want our products to be operated in the safest manner possible. 


Contact Anderson-Bolds at:
216-360-9800 
grieve@anderson-bolds.com


Saturday, December 17, 2011

Meltric DSN Spec


Anderson-Bolds and Meltric present the DSN series of deContactor. Safety First.

Detailed spec for MELTRIC DECONTACTOR Series Switch Rated Plugs & Receptacles

Note to specifying engineer: In order to specify Meltric DECONTACTOR Series plugs and receptacles, include one or all of the items below in your job specification. The items in bold are exclusive to Meltric Decontactors and thus should be included in the specification wherever practical to avoid substitution of pin and sleeve or twist type devices.

  1. Plugs and receptacles must be listed to UL Subject 2682 'Switch Rated Plugs and Receptacles.' (Alternate for Canada: Plugs and receptacles must be CSA listed to UL Subject 2682 'Switch Rated Plugs and Receptacles').
  2. Plugs and receptacles must have constant pressure butt-contacts with solid silver-nickel tips. Pin and sleeve contacts are not permitted.
  3. Receptacles must have dead front construction: live parts must be inaccessible to thin tool or wire.
  4. Plugs and receptacles must be able to close at least once on a conditional short-circuit current of 65,000A. (Short circuit testing should be performed with RK1 current limiting fuses sized at 400% of the highest full load motor ampacity associated with the device).
  5. Plugs and receptacles must incorporate an integral switching mechanism to ensure the load is broken before the plug is removed from the receptacle.
  6. Plug and receptacle wire terminals must be spring-assisted to prevent loosening due to conductor yielding, shocks, vibrations or thermal cycling.
  7. The minimum environmental rating of plugs and receptacles must be NEMA 3R (DS Series), NEMA 4X and IP 66+67 (DSN Series), or IP67 (DB Series).
  8. Ingress protection must be achieved automatically when the plug is fully inserted into the receptacles, without additional manual operation (except DB Series).
  9. Plugs and receptacles must have a system of different keying positions in order to discriminate between circuits or incompatible operating voltages or frequencies.
  10. Plugs and receptacles installed outdoor must be able to withstand UV radiation.
  11. Plugs and receptacles shall be Meltric Decontactor Series or equal.


866-360-9810

Thursday, July 8, 2010

TRC High Power GFCI's ~ Ground Fault Circuit Interrupter


Anderson-Bolds and TRC

Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Minimum ground fault protection can be incorporated into the main power disconnect device and could be considered adequate for the entire system. However, in such a design, any downstream ground fault could trip the main protective device resulting in a complete substation power outage. The NEC’s purpose, in its own words, is “the practical safeguarding of persons and property…but not necessarily efficient, convenient, or …for good service…” (Article 90.1A, B). In other words, system reliability is left to common sense and good engineering design practices. For this reason ground fault protection of the circuit may be highly desirable and recommended for reliable and continuous operation.
TRC engineers designed the HD-PRO models specifically for high current, rugged environments and these models are field-proven in all kinds of tough applications. The entire HD-PRO family (120V/30A to 600V/80A) is designed to trip within 25 milliseconds after ground fault detection at an adjustable selected trip level of 6, 10 or 30 mA.
ARC WELDING APPLICATIONS
Arc welding is described as using a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. The process of arc welding is widely used because of its low capital and running costs.
Arc welding can use either direct (DC) or alternating (AC) current as the power source to create the arc. The arc process needs a large amount of current, up to 500A, but at a relatively low arc voltage; 10 to 40V, with a typical high voltage main power supply, and 230 to 400V, that must be reduced. In all manual arc welding operations the main risk is electric shock, most likely from contact with bare live parts of the welding circuit. Appropriate protective clothing and ground fault protection is the first line of defense in the event of an electrical hazard from stray currents. Bad equipment can be replaced in a short time; however, fire and serious injury or death caused by a ground fault could shut down a facility for several days or weeks.
How to avoid electrical shock: Always use a local ground fault circuit interrupter (GFCI) with welding equipment and, prior to use, always test the GFCI for proper operation. Use well-insulated electrode holders and cables. Make sure welding cables are dry and free of grease and oil. Keep welding cables away from power supply cables. Wear dry hole-free gloves, clothing should also be dry. Insulate welder from the ground by using dry insulation such as rubber mat or dry wood. Ground frames of welding units. Never change electrodes with bare hands or wet gloves.
Fortunately, ground fault protection is easy to apply if you understand the basics. Simply put, a ground fault occurs when electrical current finds a bridge to ground via worn insulations, conductive dusts, water or other “soft grounds”, instead of the normal path back to its source. More than 80% of short circuits in equipment are ground faults, and 90% of these events are due to insulation deterioration on wires and cables. In cases where workers accidentally bridge power and ground, current in the mA range can send their heart into ventricular fibrillation.
A GFCI functions by measuring the outgoing amperage to a piece of equipment and comparing it against the return amperage. If a difference (leak) of >5 milliamps occurs (or set higher for certain equipment), the GFCI stops the flow of electricity to protect equipment and workers from potential electrocution.
Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Minimum ground fault protection can be incorporated into the main power disconnect device and could be considered adequate for the entire system. In such a design, however, any downstream ground fault could trip the main protective device resulting in a complete substation power outage. The NEC’s purpose, in its own words, is “the practical safeguarding of persons and property…but not necessarily efficient, convenient, or …for good service…” (Article 90.1A, B). In other words, system reliability is left to common sense and good engineering design practices. For this reason ground fault protection of the circuit may be highly desirable and recommended for reliable and continuous operation.
Also, in order to comply with OSHA Regulations’ recent change, “construction-like” work using temporary power arrangements which takes place in the nation’s manufacturing plants, refineries, processing facilities and other locations, must be done with workers using GFCI protected equipment.



Industrial pressure washers are powerful tools used for washing buildings, bricks, floors, storefronts, parking lots, dumpsters,
bus fleets, machinery, farm equipment, engines and more. From industrial power plants to disaster clean-up you will find all
types of high end power pressure washers being used for many industrial applications. These machines are sophisticated
and built with more durable pumps and components then the residential units. They are also used in extreme environmental
conditions requiring more power; thereby posing a greater safety risk to individuals if not used properly.
A “Ground Fault” is a dangerous electrical condition where current flows unintentionally
between a live conductor and ground. A severe or fatal electric shock can occur when a user
touches the pressure washer if the machine is ungrounded. This could happen if the power
cord to extension cord connections become wet or a fault exists within the pressure washer’s
sophisticated electrical system. GFCI’s prevent possible electrocution and equipment damage
due to electrical malfunction. Once the GFCI trips, the power is interrupted, stopping the
pressure washer power and making it electrically safe for people and preventing costly
equipment damage.
The 1987 edition of the National Electrical Code requires that pressure washers be protected by ground fault interrupters to
prevent electrocutions. Also, the Underwriters Laboratories revised UL1776 requires the use of GFCI’s for all UL listed
pressure washers effective as of May 6, 2000.
Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Guidelines for
electrical safety are:
Always use and test the ground fault circuit interrupter (circuit breaker or outlet) before using a pressure washer.
Always plug a properly grounded pressure washer into a properly grounded receptacle.
Never remove the grounding prong from the pressure washer’s power cord plug or from the extension cord.
Always have a qualified electrician check the pressure washer for electrical problems after it has tripped a circuit
breaker.


Moving large heavy loads is crucial to today's manufacturing and construction industries. Hoists are one of the top

productivity-enhancing tools found almost anywhere goods are regularly moved, worked on and/or mounted into an
assembly. Some hoists use chains, ropes, or cable, but regardless, most use A/C motors. A burnt out motor can be replaced
in a short time, but fire or serious injury or death caused by a ground fault could shut down a facility for several days or

weeks. Fortunately, ground fault protection is easy to apply if you understand the basics.
A ground fault occurs when electrical current finds a bridge to ground via worn insulations,
conductive dusts, water or other “soft grounds” instead of the normal path back to its source.
More than 80% of short circuits in equipment are ground faults, and 90% of these events are
due to insulation deterioration on wires and cables. In cases where workers accidentally bridge
power and ground, current in the mA range can send their hearts into ventricular fibrillation.
A GFCI (Ground Fault Circuit Interrupter) functions by measuring the outgoing amperage to a
piece of equipment and comparing it against the return amperage. If a difference (leak) of > 5
milliamps occurs (or set higher for certain equipment), the GFCI stops the flow of electricity to
protect equipment and workers from potential electrocution.
Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Minimum

ground fault protection can be incorporated into the main power disconnect device and could be considered adequate for the
entire system. In such a design, however, any downstream ground fault could trip the main protective device resulting in a

complete substation power outage. The NEC’s purpose, in its own words, is “the practical safeguarding of persons and

property…but not necessarily efficient, convenient, or …for good service…” (Article 90.1A, B). In other words, system
reliability is left to common sense and good engineering design practices. For this reason ground fault protection of the
circuit may be highly desirable and recommended for reliable and continuous operation.

Guidelines for electrical safety are:
Know where the GFCI is located in the hoist power system. If there is not a GFCI installed, have one installed local

to the hoist to confirm you have protection.

Always test the GFCI before using the hoist.
Always have a qualified electrician check the hoist for electrical problems after it has tripped a GFCI.

CONVEYORS

Conveyors are commonly found in factories, industrial facilities, warehouses, distribution centers and in a large number of
manufacturing workplaces. A top productivity-enhancing tool, conveyor systems are used in almost every manufacturing
environment where goods are regularly moved from one location to another. Because of this, conveyor injuries in the U.S.
may cost employers millions of dollars each year; however, with the right processes, design and safety considerations,
employers can reduce cost and liability.
Conveyors are often driven by variable speed electric motors integrated (hardwired) into
complex power systems. As with any electronic equipment they are subject to failure for many
conveyor location to isolate equipment protection and to test the GFCI prior to equipment use.
possible reasons. To protect people who use electrically-powered conveyors, each conveyor
must be equipped with a “Ground Fault Circuit Interrupter” (GFCI) preferably localized at the
GFCI’s prevent possible electrocution and equipment damage due to electrical malfunction.
Once the GFCI trips, the power is interrupted, stopping the conveyor system and making it
electrically safe for people and preventing costly equipment damage.
Ground fault protection is an important consideration for virtually all electrical equipment. A Ground Fault is a dangerous
electrical condition where current flows unintentionally between a live conductor and ground. This could happen if the power
unit or power cables become damaged, wet or a fault exists within the conveyor’ssophisticated electrical system. Avoiding
electrical accidents and equipment damage are keys to reducing liability and increasing productivity.
Guidelines for electrical safety are:
Know where the ground fault circuit interrupter is located in the conveyor power system. If there is not a GFCI
installed, report this to your safety officer.
Always test the ground fault circuit interrupter before using the conveyor.
Always have a qualified electrician check the conveyor for electrical problems after it has tripped a groundfault
circuit interrupter.




TRC engineers designed the HD-PRO models specifically for high current, rugged environments and these models are field-proven in all kinds of tough applications. The entire HD-PRO family (120V/30A to 600V/80A) is designed to trip within 25 milliseconds after ground fault detection at an adjustable selected trip level of 6, 10 or 30 mA.
Before the development of the HD-PRO Series, facilities with high current – high voltage equipment or three phase systems employed expensive ground fault breakers at the source of the branch circuit, or went without ground fault protection, leaving personnel and equipment unprotected.
Circuit breakers can withstand high current levels but have short mechanical lives and were not designed for switching duty. Localized ground faults, with circuit breakers, either shut down the whole branch circuit or were overloaded because the available devices were not portable and were often too costly.
The HD-PRO Series utilizes contactors that are fully rated for motor switching demands. In addition to being far less expensive than three phase breakers, the HD-PRO models protect expensive high current – high voltage equipment at the point of use while offering substantial shock protection for personnel.
TRC is an internationally recognized leader in electrical safety products
that protect equipment, prevent electrical fires and protect against electrocution and serious injury from electrical shock.
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