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Ground clamps and fittings that are exposed to physical
damage shall be enclosed in _____ or equivalent
protective covering. - ANSWER-a or b. 250.10
Electrically conductive materials that are likely to _____ in
ungrounded systems shall be connected together and to
the supply system grounded equipment in a manner that
creates a low-impedance path for ground-fault current that
is capable of carrying the maximum fault current likely to
be imposed on it. - ANSWER-become energized.
250.4(B)(3)
Temporary currents resulting from abnormal conditions,
such as ground faults, are not considered to be
objectionable currents. - ANSWER-True. 250.6(C)
NFPA 780, Standard for the Installation of Lightning
Protection Systems provides information on the installation
,of _____ for lightning protec-tion systems [250.4(A)(1)]. -
ANSWER-a and b. 250.4(A)(1) Note 2
If the use of multiple grounding connections results in
objectionable current and the requirements of 250.4(A)(5)
or (B)(4) are met, it shall be permitted to _____. -
ANSWER-any of these. 250.6(B)(1), (2), and(3)
An important consideration for limiting imposed voltage on
electrical systems is to remember that bonding and
grounding electrode conductors should not be any longer
than necessary and unnecessary bends and loops should
be avoided. - ANSWER-True. 250.4(A)(1) Note 1
_____ on equipment to be grounded shall be removed
from contact surfaces to ensure good electrical continuity.
- ANSWER-any of these. 250.12
Currents that introduce noise or data errors in electronic
equipment are considered objectionable currents in the
context of 250.6(d) of the NEC. - ANSWER-False.
250.6(D)
,For grounded systems, electrical equipment and
electrically conductive material likely to become energized,
shall be installed in a manner that creates a low-
impedance circuit capable of safely carrying the maximum
ground-fault current likely to be imposed on it from where
a ground fault may occur to the _____. - ANSWER-
electrical supply source. 250.4(A)(5)
In grounded systems, normally noncurrent-carrying
electrically conductive materials that are likely to become
energized shall be connected _____ in a manner that
establishes an effective ground-fault current path. -
ANSWER-a and b. 250.4(A)(4)
Grounding and bonding connection devices that depend
solely on _____ shall not be used. - ANSWER-solder.
250.8(B)
For ungrounded systems, noncurrent-carrying conductive
materials enclosing electrical conductors or equipment, or
forming part of such equipment, shall be connected
, together and to the supply system grounded equipment in
a manner that creates a low-impedance path for ground-
fault current that is capable of carrying _____. - ANSWER-
the maximum fault current likely to be imposed on it.
250.4(B)(2)
For grounded systems, electrical equipment and other
electrically conductive material likely to become energized
shall be installed in a man-ner that creates a _____ from
any point on the wiring system where a ground fault may
occur to the electrical supply source. - ANSWER-all of
these. 250.4(A)(5)
NFPA 780, Standard for the Installation of Lightning
Protection Systems provides information on the installation
of _____ for lightning protection systems [250.4(B)(1)]. -
ANSWER-a and b. 250.4(B)(1) Note
For ungrounded systems, noncurrent-carrying conductive
materials enclosing electrical conductors or equipment
shall be connected to the _____ in a manner that will limit
the voltage imposed by lightning or unintentional contact
with higher-voltage lines. - ANSWER-earth. 250.4(B)(1)