A surge arrestor may be installed under which of the following conditions:
AOn an impedance grounded system
BOn a service less than 1000 volts with a grounding electrode for the service
CEither of these
DNone of these
PEC · Question Bank
PEC
282 questions · page 5 of 15. Answer in your head first, then check the solution.
An impedance grounded neutral system is permitted to be installed if which of the following conditions is met:
AIf installed to serve a line-to-neutral
BIf installed outside in an easily accessible location
CGround detectors are installed on the system
DNone of these
Multi-wire branch circuits are permitted to supply which of the following:
AOnly line-to-line neutral loads
BOnly one piece of utilization equipment
CBoth of these
DNone of these
The minimum size of an equipment grounding conductor used to ground equipment with an automatic overcurrent device rated at 40 amps in the circuit ahead of the piece of equipment is which of the following:
A8.0 mm² copper
B8.0 mm² aluminum
C5.5 mm² aluminum
D5.5 mm² copper
For a 30 amp receptacle connected to a 30 amp branch circuit supplying two or more outlets, the total cord-and-plug load may not exceed which of the following sizes:
A24 amps
B16 amps
C15 amps
D12 amps
An equipment grounding conductor that is run with circuit conductors is permitted to be which of the following:
AA solid copper busbar
BAny flexible metal conduit
CAny liquid tight conduit
DAll of these
Restricted-access, adjustable-trip circuit breakers must meet which of the following requirements:
AHave a removable and sealable cover over the adjusting means
BBe located behind bolted equipment covers
CBe accessible only to a qualified person by means of a locked door
DAll of these
The laundry area in a single-family dwelling unit must have which of the following:
AA minimum of one 20 amp and one 220 amp receptacle
BAt least one receptacle
CAt least one receptacle installed within 3 feet of the washing machine location
DA minimum of two GFCI receptacles
Where more than one building exists on the same property under single management, additional feeders or branch circuits are permitted to supply which of the following:
AOptional standby systems
BFire pumps
CParallel power production systems
DAll of these
The use of 5-wire feeders is which of the following:
AProhibited
BRestricted to installations over 600 volts nominal
CRequires that the overcurrent device protection be 100% of the continuous load
DPermitted to use a common neutral
DC power systems located on the premises must include which of the following:
AA grounding connection at the power source
BA grounding electrode conductor which is at least #10 AWG
CA grounding ring
DAll of these
The non current-carrying metal parts of equipment shall be considered effectively grounded by use of which of the following methods:
AIf it is secured to the structural metal frame of a building
BBy use of a separate grounded circuit conductor, running in a separate raceway
CEither of these
DNone of these
An electrode that is permitted as a grounding means is which of the following:
AA metal underground water pipe
BA plate electrode
CA grounding ring
DAll of these
The grounded conductor for a single-phase 3-wire AC premises wiring system shall be which of the following:
AA grounding electrode
BThe neutral conductor
CThe common conductor
DEither grounding electrode or neutral conductor
The circuit breakers used for overcurrent protection of 3-phase circuits must have a minimum of three overcurrent relay elements that meet which of the following requirements:
AAre operated from three current transformers
BHave a neutral which is regrounded on the load side of the circuit
CHave a series rating of 125% of the total circuit load
DNone of these
Each set of conductors that feeds separate loads of a transformer secondary shall be connected in which of the following methods:
AWith an overcurrent device on the multioutlet line of the branch circuit
BIn series
CWithout overcurrent protection at the secondary
DNone of these
A single-point grounded neutral system may include which of the following:
AA grounding electrode
BA bonding jumper that connects the equipment grounding conductor to a grounding electrode conductor
CA grounding electrode conductor that connects the grounding electrode to the system neutral
DAll of these
Service equipment electrical continuity shall be ensured by which of the following:
ABonding equipment to the neutral conductor
BUse of bonding type bushings
CBoth of these
DEither of these
If the use of multiple grounding connections results in objectionable current, which of the following alterations is permitted:
AChange the location of the grounding connections
BDiscontinue one or more, but not all, of the grounding connections
CEither of these
DBoth of these
A feeder overcurrent device that is not readily available shall be installed in which of the following manners:
ABranch circuit overcurrent devices must be installed on the load side
BBranch circuit overcurrent devices shall have a lower ampacity rating than the feeder overcurrent device
CBranch circuit overcurrent devices must be installed in a readily accessible location
DAll of these