B&G chptr 2 1&2

Grounded electrical systems shall be connected to earth in a manner that will _____.

a and b. 250.4(A)(1)

Currents that introduce noise or data errors in electronic equipment are considered objectionable currents in the context of 250.6(d) of the NEC.

False. 250.6(D)

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.

True. 250.4(A)(1) Note 1

For grounded systems, normally noncurrent-carrying conductive materials enclosing electrical conductors or equipment shall be connected to earth so as to limit the voltage-to-ground on these materials.

True. 250.4(A)(2)

The grounding of electrical systems, circuit conductors, surge arresters, surge-protective devices, and conductive normally noncurrent-carrying metal parts of equipment shall be installed and arranged in a manner that will prevent objectionable current.

True. 250.6(A)

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)].

a and b. 250.4(A)(1) Note 2

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.

a and b. 250.4(A)(4)

NFPA 780, Standard for the Installation of Lightning Protection Systems provides information on the installation of _____ for lightning protection systems [250.4(B)(1)].

a and b. 250.4(B)(1) Note

Ground clamps and fittings that are exposed to physical damage shall be enclosed in _____ or equivalent protective covering.

a or b. 250.10

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.

all of these. 250.4(A)(5)

_____ on equipment to be grounded shall be removed from contact surfaces to ensure good electrical continuity.

any of these. 250.12

Grounding and bonding connection devices that depend solely on _____ shall not be used.

solder. 250.8(B)

Temporary currents resulting from abnormal conditions, such as ground faults, are not considered to be objectionable currents.

True. 250.6(C)

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 _____.

any of these. 250.6(B)(1), (2), and(3)

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.

become energized. 250.4(B)(3)

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.

earth. 250.4(B)(1)

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 _____.

electrical supply source. 250.4(A)(5)

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 _____.

the maximum fault current likely to be imposed on it. 250.4(B)(2)