[Eng-div] Reminder to Engineering Staff

[Gayle Coleman]

/*The following message is being sent on behalf of Henry Robertson, 
Engineering DSO:*/

*Just a reminder about the use of GFCI devices:
***/
(GFCI circuits are always required in JLab tunnel environments and most 
other concrete/slab structures!)
/*
ES&H Manual
6200 Appendix T4* *- General Electrical Safety Guidelines*

*4.2**Ground-Fault Circuit Interrupter 
<http://www.jlab.org/ehs/ehsmanual/Glossary.htm#GFCIDef> (GFCI)*

GFCI is a device intended for the protection of personnel.It de-energize 
a circuit, or portion thereof, within an established period of time when 
current to ground exceeds approximately 6mA.A GFCI is required:

·Per the National Electrical Code.They are installed in all new 
construction and renovation projects as required.

·Where 125-volt single-phase; and 15- and 20-ampere receptacles are 
installed (i.e., bathrooms, kitchens, rooftops, outdoors, and within six 
feet of the outside edge of a sink).

·For all receptacle outlets (including extension cords, and temporary 
wiring used to supply power to equipment during construction, 
remodeling, maintenance, repair, or demolition of buildings, structures, 
or equipment, or similar activities.)

·For use with:

oCord-and-plugged vending machines (installed after 1/1/2005).

oElectric drinking fountains (installed after 1/1/2008).

oPortable generators -- for all 125-volt single-phase 15-, 20-, and 
30-ampere receptacles that are in use by personnel.

·When supplying temporary power, with the use of extension cords, in a 
damp or wet location.

·When supplying temporary power for Jefferson Lab sponsored events -- 
for all 125-volt single-phase 15-, 20-, and 30-ampere receptacles that 
are in use by personnel.

*4.2.1**Testing GFCI*

Jefferson Lab recommends that GFCI receptacles be tested in accordance 
with manufacturer's recommendations, periodically, and before using a 
device after an extended period of time.

*4.2.2**Types of GFCIs*

*4.2.2.1**Receptacle:*A GFCI receptacle is used in place of a standard 
outlet (see Figure 1.GFCI Receptacle).These are generally found near 
water sources (e.g., kitchens, bathrooms, etc.).

*Figure 1.**GFCI Receptacle*

gfci receptacle1gfci receptacle2

*4.2.2.2**Portable:*A portable GFCI is used to provide temporary power 
from an unprotected outlet.They are tested prior to each use (see Figure 
2.Portable GFCIs).

*Figure 2.**Portable GFCIs*

Portable GFCI

*4.2.2.3**Circuit Breaker:*A GFCI circuit breaker controls an entire 
circuit on the main panel board.In the event of a ground fault, short 
circuit, or overload the breaker trips and shuts off electricity to 
circuit.Only those persons who have been trained by a qualified 
electrical worker are authorized to reset GFCI circuit breakers.Contact 
Facilities Management (x7400) for assistance if electricity is 
interrupted to your work area.



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