Personnel Protection GFCI for Industrial Systems

1

Personnel Protection GFCI

for Industrial Systems

2 Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2016 PROTECT | CONTROL | SENSE

Table of contents

1. Electricity, Water, and People: A Dangerous

Combination……………………………..3-8

2. GFCI Devices: How they work………...9-10

3. Gaps in Personnel Protection for Industrial

Applications…………………………….11-12

4. The Solution: UL 943C Ground-Fault Circuit-

Interrupters…………………………….13-14

5. Industrial GFCI: SB6000

Series…………………………………..15-18

6. Applications…………………………....19-25

1. Electricity, Water, and People:

A Dangerous Combination

Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2016 PROTECT | CONTROL | SENSE



Combination



Combination

The Hazard – Electrocution and the Implications The statistics show the real danger from electricity in the workplace.

5th leading cause of death from 1980

to 1992

– 7% of all work fatalities (411

deaths per year) Source: NIOSH

3 killed every 4 days from 1992 to

2010

– 5% of all work fatalities (270

deaths per year) Source: BLS

$160.4 billion was the cost of US

workplace injuries in 2006*

Over $30 million per incident in fines,

medical, litigation, lost business, and

equipment costs*

Over $19 billion is the total annual

cost of occupational injuries to the

Canadian economy**

Electrical Fatalities – US

Source: Electrical Safety Foundation International *Source: National Safety Council

**Source: Human Resources and Skills Development

Canada



Combination

Types of Electrical Injuries* Effects & Severity of Electric Shock

Fall Related Injuries occur because

electric shock may cause muscles to

contract causing loss of balance.

Explosions from electrical incidents can

also cause a fall.

Burns are the most common non-fatal

injury (internal from electric shock or

external from arc flash).

Electrical Shock occurs when electrical

current passes over or through a person.

The reflex response could possibly involve

trauma, burns, abnormal heart rhythm and

unconsciousness.

Electrocution is the result of fatal electric

shock

Electric Shock can leave lasting & life altering effects including disagreeable sensation and involuntary muscular contraction. Ventricular fibrillation is a major risk. It is the most serious cardiac rhythm disturbance and occurs when the lower chambers quiver and the heart can't pump any blood, causing cardiac arrest. The AC current flow through the body generates periodic excitation.**

Severity of Shock*** depends on:

• The path of current through the body

• The amount of current flowing through the body

• The length of time the body is in the circuit

*Source: Prevention Strategies for Electrical Hazards © 2008

National Safety Council

**Source: American Heart Association

***Source: Prevention Strategies for Electrical

Hazards © 2008 National Safety Council

Common Types of Electrical Injuries and Their Effects


Low Voltage Does Not Imply Low Hazard

Physiological

effects of 50/60

Hz AC current

on the human

body


Combination



Combination

The Solution – Personnel Protection GFCI devices are commonplace and mandated for residential applications

Class A Ground Fault Circuit Interrupters

(GFCIs) are defined by UL 943 & CAN/CSA-

C22.2 No. 144.1–06 and mandated by NEC &

CEC. These types of household GFCIs protect

personnel in residential applications by working

as a fast-acting circuit breaker. They have a very

low pick-up current of (6 mA).

There are two types of GFCIs:

– Permanently-connected

Receptacle, GFCI breaker

– Portable

Cord-connected

2. GFCI Devices: How they work



2. GFCI Devices: How they work

1. Current travels through body

2. CT picks up the ground fault

3. Sensor detects fault and opens circuit. Fault is

cleared and personnel are protected.

The GFCI looks at the current going out and compares it to the current coming back. If that

comparison doesn’t match, then there is leakage. The GFCI detects the leakage and interrupts

the circuit, significantly reducing or eliminating the shock potential.

3. Gaps in Personnel Protection

for Industrial Applications



3. Gaps in Personnel Protection for Industrial

Applications

GFCI Facts and the Personnel Protection Gap Since mandated by NEC in 1973 a 50% reduction in residential electrocutions have been accredited to

GFCIs.* 280 lives could have been save each year, had each household been equipped with GFCIs.

*Source: Electrical Safety Foundation International

Class A GFCIs are governed by UL 943.

Most Class A GFCIs are appropriate for

residential applications. These devices do

not monitor the load-ground and have a 150

V line-to-ground max. (240 V systems). The

6 mA trip level is too low for most industrial

equipment.

As a result, UL identified the need for new

GFCI classes appropriate for industrial

applications.

INDUSTRIAL PERSONNEL PROTECTION IS LACKING

Source: NEMA

4. The Solution: UL 943C

Special-Purpose Ground-Fault

Circuit-Interrupters



4. The Solution: UL 943C Special-Purpose

Ground-Fault Circuit-Interrupters

UL 943C was introduced to address the

limitations of Class A GFCIs, namely the

system voltage limitation to a maximum of

240V and a maximum allowed leakage current

of 6 mA. These new Classes C, D, and E

governed by UL 943C,Special-Purpose

Ground-Fault Circuit-Interrupters are rated up

to 600V, with a trip level of 20 mA.

Special-Purpose GFCI Usage:

1. Line-to-ground voltage is greater than 150

volts (i.e. 480 V & 600 V systems) and

equipment grounding or double insulation is

required by the National Electrical Code,

ANSI/NFPA 70

2. Line-to-ground voltage is 150 volts or less

(i.e. 208 V & 240 V) and equipment grounding

or double-insulation is provided, but the use of

a Class-A GFCI is not practical.

UL 943C is released in 2012 Littelfuse introduces the only

Special-Purpose GFCI Listed to

UL 943C.

Fully patented Industrial Shock-Block™

SB6000 Series

5. Industrial GFCI: SB6000

Series



5. Industrial GFCI: SB6000 Series

Industrial Shock-Block™ SB6000 Series is available in two models:

SB6100 Equipment Ground-Fault Protection Device

(EGFPD)

SB6100 Ground-Fault Circuit-Interrupter (GFCI)

The key difference between these models is the trip level.

The SB6100 GFCI has a fixed 20 mA trip level which allows for protection for systems with a

leakage current higher than the standard 6 mA required by UL 943 Class A. The SB6100

EGFPD offers more flexibility with variable setpoints (6 mA, 10-100 mA in increments of 10

mA).



Features Benefits

UL 943 inverse time trip curve Reduces the probability of nuisance tripping

UL 943C ground monitor/interrupt Protects from shock by tripping if continuity of ground wire

between the Industrial Shock-Block and load is broken.

CSA Meets a benchmark for safety and performance

Undervoltage, brownout, chatter detection Prolong the internal contactor lifetime

3 x Class T, 600 V incoming fuses Provides overcurrent protection for the internal contactor

Conformal coating Internal circuits are conformally coated to protect against

corrosion and moisture

Operator Interface Shows unit status, alarm types, and % of leakage current,

and also allows for TEST/STOP and RESET/START

capabilities

Custom-designed mobile cart Provides easy mobility with a light, aluminum frame

Cart mounting frame Provides 50 lbs of cable storage

Self-test Self-tests frequently to ensure the unit is operating

properly

Motor Starter Allows the user to start the motor from the interface using

the TEST/STOP and RESET/START buttons



The SB6000 Series – Connection Diagram

Industrial Shock-Block Cart

and Frame

The SB6100 is installed in-line

between incoming power (main

circuit breaker) and the load. The

open-chassis SB6100 can be

installed in electrical equipment.

The enclosed version is typically

wall-mounted but can also be

made mobile with the Industrial

Shock-Block Cart and Frame.

6. Applications



6. Applications

Sump Submersible Pump*

Water injected into mine pits

Pumping station by the river

Sump is cleaned while power is on

*Courtesy of PCS Patience Lake


6. Applications

Stud Gun Welder *

Move around the shop floor

Welding outlets all around

the shop

6-ft cable with a 60 A welding plug

*Courtesy of Liberty Fuel Company


6. Applications

Concrete Drilling & Sawing*

*Courtesy of Canadian Cutting and Coring

Cutting saws exposed to wet conditions

because the supply cables run out the back of

the truck.

SB6100 EGFPD mounted inside the truck


6. Applications

Manufacturing/Processing

Food & Beverage

Mixers

Heaters

Fans

Tile/concrete cutters

Conveyors & Hoists

Elevators & Escalators

Paint booths

Pressure washers

Submersible pumps

Arc welders

Portable lighting

Motors

Compressors


6. Applications

Entertainment Aquariums

Fountains

Swimming pools

Amusement parks

Water slides

Golf courses

Fairs

Zoos

Municipal/Institutional Water treatment plants

Generating stations

Airports

Subways

Train & Bus stations

Hotels & Restaurants

Resorts

Convention centers

Marinas


6. Applications

Temporary Wiring for Buildings

– Construction

– Remodeling

– Repair/Maintenance

Eliminate need for Assured Equipment

Grounding Conductor Program

– Special-Purpose GFCI that provide shock

protection and monitor integrity of equipment

grounding circuits

Major oil company installed

SB6100 Special-Purpose GFCI

in mobile NEMA 3R enclosure

that feeds 480V, 3-phase power

to portable sump pump.

Eliminated need to conduct an

assured equipment grounding

program

Read the whitepaper

Littelfuse.com/ShockProtection

Portable Sump Pump

http://www.littelfuse.com/shockprotection




Click here to learn more:

Littelfuse.com/shockprotection

An Industrial Special-Purpose GFCI is vital where people,

electricity and water are present. Class A GFCIs are not suitable for

industrial applications therefore GFCIs designed and approved per UL

943C can provide the critical protection required. The Industrial

Shock-Block™ SB6000 Series is the first is UL 943C listed device

for industrial applications.




Engineering

Personnel Protection GFCI for Industrial Systems