grounding and bonding concept check

Lakukan tugas rumah & ujian kamu dengan baik sekarang menggunakan Quizwiz!

Which of the following cannot be used as a grounding​ electrode?

10' black iron gas pipe

If a circuit breaker ahead of a fault trips at 100 amperes of​ current, what is the maximum value of fault current that may flow through

100 amperes a​ fault?

Which one of the following systems does not have to be​ grounded?

24VAC control circuit

The maximum length of the conductor allowed when running a bonding conductor outside a raceway is​ _____.

6 feet

Where must the EGC originate in a separately derived system that originates in a​ transformer?

At the primary

Equipment grounding connects to which of the​ following?

Enclosures

System grounding connects the metal parts of the system like the boxes and motor frame to the electrical​ system's neutral conductor.

False

What is the EGC designed to​ carry?

Fault current

If a hot conductor contacts the metal enclosure of a​ panel, is this considered a ground fault or a short​ circuit?

Ground fault

What do we have if the neutral conductor contacts a metal receptacle​ box?

Ground fault

Which of the following items is not a component of the resistance of a grounding​ system?

Impedance of any transformers in the system

What NEC​® article covers grounding and​ bonding?

NEC Article 250

Where would you find the requirements for sizing a grounding electrode​ conductor?

NEC Table 250.66

Which conductor carries unbalanced​ current?

Neutral

Can a standard ohmmeter be used to effectively measure the resistance of a grounding​ system?

No

Can a​ three-point resistance test be performed when only one electrode is​ installed?

No

Do you need to bond a plastic enclosure to the grounding​ system?

No

If multiple conduits enter an enclosure and the rules say that these conduits must be​ bonded, must you install a separate bonding jumper from each of them to the grounding terminals at the​ enclosure?

No

When running power from one building to​ another, must you always run both the EGC and the grounded conductor to the second​ building?

Only in certain conditions

Which of the following circuits must be​ grounded?

Separately derived systems

In a​ three-phase system, if Phase A conductor contacts Phase B​ conductor, what has taken​ place?

Short circuit

What factor determines the size of the​ EGC?

Size of the fuse in the circuit

Which of the following materials cannot be used as a grounding electrode​ conductor?

Stranded galvanized steel

Which one of the following methods should not be used to ground a metal residential receptacle​ box?

The bare ground wrapped around the screw that holds the receptacle

Why are all the​ noncurrent-carrying metal parts bonded together in a wiring​ system?

To provide a​ low=resistance path to ground

A metal underground tank or metal well casing can be used as a grounding electrode.

True

The grounded conductor and the grounding conductor are one and the same conductor and perform the same function.

false

The purpose of an effective grounding path is to conduct any​ _____ that might occur in the system.

fault current

To be​ effective, grounding systems must​ _____.

protect the system from lightning

Resistance to earth of a grounding electrode is commonly measured using the​ _____ method.

​fall-of-potential


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