Elmec 1120 Chapter 6

Residential GFCI devices are set to trip on a ground-fault current above ______ milliamperes

5

Explain the operation of a ground-fault circuit interrupter. Why are GFCI devices used? Where are GFCI receptacles required?

A GFCI is intended to stop people from becoming the ground. GFCIs are required in all outside receptacles, bathrooms and in kitchens within 6ft of the sink

The term SPD is becoming quite common. What do the letters stand for?

A serge protection device protects against transient voltage

Construction sites can be dangerous because of the manner in which extension cords, portable electrical tools, and other electrical equipment are used and abused. To reduce this hazard, 590.6(A) of the NEC requires that all 125 volt, single phase, 15-, 20-, and 30-ampere receptacle outlets used for temporary wiring must be ____protected.

GFCI

The Code requires GFCI protection for certain receptacles in the kitchen. Explain where these are required.

GFCI protection is required for receptacles within 6ft of a sink

You are asked to replace a receptacle. On checking the wiring, you find that the wiring method is in conduit and that the wall box is properly grounded. The receptacle is of the older style 2-wire type that does not have a grounding terminal. You remove the old receptacle and replace it with what?

GFCI receptacle

What two types of receptacles are permitted to be used to replace a defective receptacle in an older home that is wired in knob-and-tube wiring where no equipment grounding means exists in the box?

GFCI receptacle outlet

GFCI protection is available as (a) branch-circuit breaker GFCI, (b) feeder circuit-breaker GFCI, (c) individual GFCI receptacles, and (d) feed-through GFCI receptacles. In your opinion, for residential use, what type would you install?

GFCI receptacles

Transients (surges) on a line can cause spikes or surges of energy that can damage delicate electronic components. A SPD device contains one or more that bypass and absorb the energy of the transient.

MOV Metal oxide varistors

Extremely long circuit runs connected to a GFCI branch-circuit breaker might result in: (Circle the correct answer.)

Nuisance tripping of the GFCI

If a person comes in contact with the "hot" conductor and the grounded conductors of a 2-wire branch circuit that is protected by a GFCI, will the GFCI trip off? Why?

Yes it will because the GFCI functions by sensing the unbalanced load between the hot and neutral conductor.

Where must GFCI receptacles be installed in residential garages?

everywhere (except fire alarms and smoke detectors)

What color are the terminals of a standard grounding-type receptacle?

green

What special shape and color are the grounding terminals of receptacle outlets and other devices?

green hex 10-32

Is it a Code requirement to install GFCI receptacles in a fully carpeted, finished recreation room in the basement?

no it does not

In your own words, explain why the Code does not require certain receptacle outlets in kitchens, and basements to be GFCI protected.

smoke and fire alarms

What might happen if the line and load connections of a feed-through GFCI receptacle were reversed?

would not work

A homeowner calls in an electrical contractor to install a separate circuit in the basement (unfinished) for a freezer. Is GFCI protection of the receptacle required?

yes

Is a GFCI receptacle permitted to be installed as a replacement for old two prong outlets?

yes must be labeled with no ground sticker