NCCER ELECTRICAL LEVEL 2 GROUNDING AND BONDING And INTRO TO ELECTRICAL CIRCUITS
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NCCER ELECTRICAL
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NCCER ELECTRICAL
NCCER ELECTRICAL LEVEL 2 GROUNDING AND BONDING And INTRO TO ELECTRICAL CIRCUITS
NEC Article 250 - ANS Is the primary governing article for the proper use and installation of grounding and bonding
short circuit - ANS a conducting connection, whether intentional or accidental, between any o...
NCCER ELECTRICAL LEVEL 2
GROUNDING AND BONDING And INTRO
TO ELECTRICAL CIRCUITS
NEC Article 250 - ANS Is the primary governing article for the proper use and
installation of grounding and bonding
A
short circuit - ANS a conducting connection, whether intentional or accidental,
between any of the conductors of an electrical system, whether it is from line-to-line or
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from line-to-neutral
Ground fault - ANS as defined in NEC Article 100, is an unintentional, electrically
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conducting connection between an ungrounded conductor of an electrical circuit and the
normally noncurrent-carrying conductors
equipment grounding conductor - ANS the conductive path used to connect the
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noncurrent-carrying metal parts of equipment, raceways, and other enclosures to the
system grounded conductor, the grounding electrode conductor, or both.
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Grounding systems less than 50v - ANS 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 - ANS must be grounded if they supply mobile or
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portable equipment as covered in NEC Section 250.188
5A ( 50-45=5) - ANS 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
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-Lightning,
-voltage surges higher than that for which the circuit is designed - ANS a grounded
system must limit the voltage on the electrical system and protect it from
Grounding electrode system - ANS 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 - ANS how thick must plates of iron or steel
how thick must nonferrous metal like copper be
20 ohms or less - ANS 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 - ANS grounding electrodes must be spaced
metal underground gas piping systems - ANS may not be used as a grounding
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electrode
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NEC Table 310.16 - ANS is used to determine the size of the service conductor from
its ampacity.
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Rod and pipe electrodes - ANS shall not be less than 8' in length nor smaller than 3/4"
trade size, and if iron or steel, shall be galvanized or metal-coated for corrosion
protection
IS
a 45 degree angle - ANS if an obstruction is encountered, the rod/pipe may be driven
at not more than _ to clear the rock. The other possibility is for the rod to be buried in a
trench that is at least 30" deep
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NEC Table 250.122 - ANS The size of the EGC is determined from the size of the
overcurrent device that is protecting that particular system.
Type NM cable - ANS if nonmetallic boxes are used with __, no connection to the box
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itself is required.
Grounding outlet boxes - ANS If two or more cables enter the nonmetallic box, each of
the equipment grounding wires must be connected together with an approved
connector, and one wire must then be attached to the grounding terminal on the
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receptacle. The terminal itself may not contain more than one grounding wire
Electrical continuity - ANS the key to successful clearing of ground fault currents
main bonding jumper - ANS when a listed switchboard or panelboard is installed, the
__ that is provided with the equipment is rated for the size of conductors used for the
service.
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