NEC National Electrical Code CH2 {Article 250-285}

True

Ferrous metal raceways and enclosures for grounding electrode conductors shall be electrically continuous from the point of attachment to cabinets or equipment to the grounding electrode.

True

Grounding electrode conductors that re not subject to physical damage can be run exposed along the surface of the buildng construction if securely fastened to the surface on which it is carried.

5/8

Grounding electrodes of the rod type less than ______ in. in diameter shall be listed.

NOT : Rigid metal conduit NOT : Intermediate metal conduit NOT: Electrical metallic tubing

The code requires the installation of an equipment grounding conductor of the wire type in _______.

necessary

The conductors used to connect the surge protective device tot he line or bus and to ground shall not be any longer than _____ and shall avoid unnecessary bends.

main bonding jumper

The grounded conductor of an alternating-current system operating at 1,000V or less shall be routed with the ungrounded conductors and connected to each disconnecting means grounded conductor terminal or bus, which is then connected to the service disconnecting means enclosure via a(n) ________that is installed between the service neutral conductor and the service disconnected means

ground detectors installed the ground detection sensing equipment connected as close as practicable to where the system receives its supply

Ungrounded alternating-current systems from 50V to 1,000 or less that are not required to be grounded in accordance with 250.20(b) shall have _________.

the source the first disconnecting means

Ungrounded alternating-current systems from 50V to less than 1,000 shall be legibly marked "Caution: Undergrounded System - Operating _______ Volts Between Conductors" at _________ of the system with sufficient durability to withstand the environment involved.

True

When supplying a grounded system at a separate building or structure, an equipment grounding conductor shall be run with the supply conductors and connected to the building or structure disconnecting means and to the grounding electrode(s).

circular mil area

When ungrounded circuit conductors are increased in size to account for voltage drop, the wire-type equipment grounding conductor shall be proportionally increased in size according to the increase in size of the ungrounded conductors using their _______

True

Where more than one concrete-encased electrode is present at a building or structure,it shall be permitted to bond only one into the grounding electrode system.

30 in.

Where rock bottom is encountered when driving a ground rod at an angle up to 45 degrees, the electrode can be buried in a trench that is at least _______ deep.

multiple individual grounding electrode conductors one grounding electrode conductor at a common location a common grounding electrode conductor and taps

Where service equipment consists of more than one enclosure, grounding electrode conductor connections shall be permitted to be _______.

6

Grounding electrode conductors ______ AWG and larger that are not exposed to physical damage can be run along the surface of the building construction without metal covering or protection.

solid stranded insulated or bare

Grounding electrode conductors of the wire type shall be _______

the conditions of maintenance and supervision ensure that only qualified persons service the installation ground detectors are installed on the systme line-to-neutral loads are not served

High-impedance grounded neutral systems shall be permitted for three-phase ac system of 480V to 1,000V where ________.

Shall

Lightening protection system ground terminals ______ be bonded to the building or structure grounding electrode system.

True

Surge arrestors 1,000V or less are also known as Type 1 surge protective devices (SPDs).

True

Surge protective devices shall be marked with a short-circuit current rating and shall not be installed where the available fault current is in excess of that rating.

20

A bare 4 AWG copper conductor installed horizontally near the bottom or vertically, and within that portion of a concrete foundation or footing that is in direct contact with the earth, can be used as a grounding electrode when the conductor is at least _____ ft in length.

True

A grounded circuit conductor is permitted to ground noncurrent-carrying metal parts of equipment, raceways, and other enclosures on the supply side or within the enclosure of the ac service disconnecting means.

Grounding electrode

A separate bonding jumper to the building structural metal shall not be required if the metal frame of a building or structure is used as the _____ for the separately derived system.

Metal underground gas piping systems Aluminum

________ shall not be used as grounding electrodes.

limited voltages due to lightning, line surges, or unintentional contact with higher-voltage lines stabilize the voltage-to-ground during normal operation

grounded electrical systems shall be connected to earth in a manner that will ________.