308 Equipment Grounding And Equipment Grounding Conductors Flashcards
A _____ is permitted to serve as equipment grounding conductor.
I. Bare conductor included as part of a list cable assembly
II. Metallic cable sheath to armor
III. Metallic water pipe system
a. I & lII only
b. II & III only
c. II only
d. I & II only
e. I only
f. None of these
d. I &II only
Under conditions of maximum ground fault current flow, an equipment grounding system should ____.
I. Incorporate adequate conductance. II. Not present a fire hazard
a. I only
b. II only
c. Both I & II
d. neither I nor II
c. Both I & II
A circuit is installed in EMT and compression fittings are used. A separate EGC is not installed in the conduit. If a ground fault occurs and one or more couplings were never tightened properly, compared to normal operation, the fault current will be ____ and the OCPD will take ____ time to open.
a. Lower Less
b. Higher More
c. Lower More
d. lower The same
e. Higher More
c. Lower More
Which part of article 250 covers equipment grounding and equipment grounding conductors.
a. I
b. IV
c. VI
d. III
c. Part VI
During periods of ground fault, loose couplings and connectors used in metal conduit systems can cause fire hazard.
a. True
b. False
a. True
The equipment grounding conductor size according to the type of material (copper, aluminum, copper-clad aluminum) used for Phase conductors and the cross-section areas of the phase conductors.
a. True
b. False
b. False
For portable tools used in other than residential occupancies, NEC 250.114(4)(g) exception allows the use of _____ in lieu of grounding.
a. Drain wires
b. Metallic shielding
c. Isolation transformers
d. Double insulation
c. Isolation transformers
The resistance of conductor is inversely proportional to the Cross-section area. This means that the resistance _____  as the Cross-section area of the conductor increases.
a. Decreases
b. Increases
a. Decreases
To avoid arcing and sparking at the threaded joints in RMC and IMC, the threads must be _____ Before assembly.
a. Cleaned
b. Tack-welded
c. Cut
d. All of these
a. Cleaned
During periods of ground fault, a circuit that utilizes large circuit conductors will have a _____ level of fault current than a circuit with small conductors.
a. Lower
b. Higher
b. Higher
When a circuit is installed in a metal conduit, installation of an _____ Equipment grounding conductor reduces the ground fault current path Impedance and makes it more effective.
a. External
b. Internal
b. Internal
Under ground fault current conditions, inductive reactance will exert a powerful influence in directing a return (fault) Current to flow in the path that is _____ The outgoing power (“hot”) conductor.
a. In close proximity to
b. In parallel with
c. Both a & b
c. Both a & b
When the EMT is used as the EGC for a circuit, its length has no effect on the opening time of the circuit breaker protecting the circuit.
a. True
b. False 
b. False
You have installed 465 feet of PVC underground from a breaker panel to a sign. The sign circuit is protected with a 15 amp breaker. Instead of installing a ground conductor with the circuit conductors could you drive a ground rod at the base of the metal sign and bond the sign to it.
a. Yes
b. No
b. No
Some types of AC and MC cables are furnished with an integral ______ Equipment grounding conductor for the purpose of establishing an isolated ground.
a. Covered
b. Bare
c. Insulated
d. All of these
The equipment grounding conductor is normally _____ in color.
a. Light grey
b. Green
c. White
d. Black
b. Green
NEC section 250.119(A)(2) Permits an insulated conductor, larger than 6 AWG, Of a basic color other than green to be used as an equipment grounding conductor when which of the following conditions is satisfied?
a. The identification encircles the conductor
b. The likelihood of a fault is low
c. The Installation is a separately derived system
d. Ground monitors are provided
a. The identification Encircles the conductor
NEC section 250.118 permits _____ To be used as an equipment grounding conductor.
a. The armor of type MC cable
b. The armor of type AC cable
c. The steel sheath of type MI
d. All of these
You are to run a circuit underground in PVC conduit from a service panelboard to an isolated ground receptacle. The isolated ground receptacle is mounted in a metal box. Along with the circuit conductors you will pull in ______.
a. One grounding conductor and connect it to the metal box
b. Ungrounded conductor and connect it to the green screw on the receptacle
c. Both a and b
d. Neither a nor b
c. Both a and b
Grounding requirements for equipment operating at “Over 150 V to ground” Apply to which of the following voltage systems?
I. 120/240, 1phase, 3-wire. II. 120/208, 3 phase, 4-wire III. 120/240, 3phase, 4-wire
a. I, II & III
b. I & II only
c. II & III only
d. II only
e. I & III only
f. III only
f. III only
When a separate equipment grounding conductor (wire) Is installed and a metal Raceway, the wire is in _____ with the raceway.
a. Series
b. Parallel 
b. Parallel
Refer to figure 308.7. The FMC was installed to provide flexibility to this motor. Does the NEC require that an equipment grounding conductor be installed with the conduit to maintain grounding continuity?
a. Yes
b. No
a. Yes
The requirements in section NEC 250.110, To ground equipment fastened into place or connected by a permanent wiring method, exempt which of the following?
a. Double-insulated equipment
b. Fire pumps
c.Portable electrical appliances
d. None of these
a. Double-insulated equipment