Nccer Electrical Level 2 Grounding And
Bonding Questions And Answers With
Verified Solutions Already Passed!!!
NEC Article 250 - ANSWER✔✔Is the primary governing article for the proper use
and installation of grounding and bonding
short circuit - ANSWER✔✔a conducting connection, whether intentional or
accidental, between any of the conductors of an electrical system, whether it is
from line-to-line or from line-to-neutral
Ground fault - ANSWER✔✔as defined in NEC Article 100, is an unintentional,
electrically conducting connection between an ungrounded conductor of an
electrical circuit and the normally noncurrent-carrying conductors
equipment grounding conductor - ANSWER✔✔the conductive path used to
connect the noncurrent-carrying metal parts of equipment, raceways, and other
enclosures to the system grounded conductor, the grounding electrode conductor,
or both.
Grounding systems less than 50v - ANSWER✔✔grounding is required in the
following situation where supplied by transformers if the supply voltage to the
transformer exceeds 150v to ground
Grounding AC systems over 1kV - ANSWER✔✔must be grounded if they supply
mobile or portable equipment as covered in NEC Section 250.188
, 5A ( 50-45=5) - ANSWER✔✔a single phase system has two legs, Leg A and Leg
B. Leg A is carrying 50A and leg B is carrying 45A, the current carried by the
neutral is what
-Lightning,
-voltage surges higher than that for which the circuit is designed - ANSWER✔✔a
grounded system must limit the voltage on the electrical system and protect it from
Grounding electrode system - ANSWER✔✔In general, all the following electrodes
that are present must be bonded together to form
steel or iron must be at least 1/4" thick
copper need only be 0.06" (1.5mm) thick - ANSWER✔✔how thick must plates of
iron or steel
how thick must nonferrous metal like copper be
20 ohms or less - ANSWER✔✔Rod, pipe, and plate electrodes must have a
resistance to ground of__. If not, they must be augmented by an additional
electrode spaced not less than 6' from the first
at lest 6' apart - ANSWER✔✔grounding electrodes must be spaced
metal underground gas piping systems - ANSWER✔✔may not be used as a
grounding electrode
NEC Table 310.16 - ANSWER✔✔is used to determine the size of the service
conductor from its ampacity.
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