3rd 2nd Q1 Lessons 5,6

The NEC requires that a ______ be provided in the grounded conductor for service equipment

Disconnecting means

Where the service disconnecting means is made up of two to six disconnects in a single listed service equipment assembly how many main bonding jumper is required within the listed assembly

1

Where a grounded is using two 500 kcmil copper conductors in parallel (in two separate raceways) for each Underground Service conductor what is the minimum size for the grounded conductor in each race was supplying the

1 / 0 AWG

If the ungrounded service conductors are 600 kcmil copper, what is the minimum size required for the grounded conductor Supplying the same service

1/0 AWG

What is the minimum size copper grounding electrode conductor required for a service with service conductor size 500 kcmil copper to a water pipe electrode

1/0 AWG

An aluminum grounding electrode conductor is not permitted to be connected to a grounding electrode at a distance less than ____ from the earth

18 inches

The NEC generally requires all metal enclosures and raceways for service conductors to be grounded except for metal elbows and a run of non-metallic service Raceway that are isolated from contact by persons by not less than _____ of cover to any part of the elbow

18"

The minimum size grounding electrode conductor required for a ring type Electro is not less than ___ AWG copper

2

What is the minimum size copper grounding electrode conductor required for a service with 4/0 AWG service entrance conductors to a structural building frame electrode

2 AWG

What is the minimum size required for a copper wire type main bonding jumper for a service with a conductor size 300 kcmil copper and a water pipe electrode

2 AWG

If a service is supplied by 4 / 0 AWG copper ungrounded service entrance conductors what is the minimum size grounding electrode conductor required to a metal underground water pipe electrode

2 AWG COPPER

What is the minimum size aluminum main bonding jumper (wire type) for service if the largest ungrounded service conductor is 5000 circular mil copper

3/0 AWG

If the grounding electrode conductor in question 25 is a 3/0 copper, what is the minimum size required for the required bonding jumper

3/0 AWG copper

What size copper grounding electrode conductor is required for a 6000 amp service supplied by 10 750 kcmil copper service conductors in parallel for each ungrounded phase conductor

3/0 AWG copper

What is the largest size required for a copper grounding electrode conductor that is a sole to a concrete encased electrode

4 AWG copper

If the DC system source is located on the premises the grounding electrode conductor connection is required to be made at which of the following locations

At the first system disconnecting means or overcurrent protection device comma at the source, but other means that provides equivalent protection and utilizes listed and identified equipment

Grounding electrode conductors are permitted to have which of the following physical characteristics

Bare, covering, insulation

The grounded neutral conductor serves which two purposes for a grounded service

Carries the maximum unbalanced return neutral load Serves as an effective ground fault current path in ground fault conditions

Where's places made in a grounding electrode conductor which of the following methods are permitted

Exothermic welding , irreversible compression connections , splices on bus bars

A grounding electrode conductor installed for a communication system is required to besides using NEC table 250. 66

False

General electrode conductors are not permitted to be installed by routing them through metal framing members

False

Meter socket enclosure sealed by the utility make see enclosure inaccessible, by definition

False

The grounded conductor of a service must always be a neutral conductor

False

The service equipment that is listed as suitable for use only as service equipment includes a main bonding jumper

False

Where a service supplied by an ungrounded system, the grounded conductor is required to be routed to the service disconnecting means enclosure and bonded to it

False

When using the common grounding electrode conductor tap method for grounding services with separate disconnecting means enclosure comma the minimum size required for the common grounding electrode conductor is not less than 3 / 0 copper or 250 aluminum

False. There is a difference between the common grounding electrode conductor tap concept used for separately derived systems 250.30 A6 And the ones used for services covered by 250.64 D1

Where system is grounded the service must be supplied with a _____ conductor

Grounded

For Grounded service, the ____ is the intentionally constructed, low-impedance, effective ground fault current path addressed in 250.4(A)

Grounded conductor

More than one grounding electrode conductor is not permitted to be connected to a grounding electrode unless the single clamp is __ for use with multiple conductors

Listed

The ____ is a conductor connected to the neutral point of a system that is intended to carry current under normal conditions

Neutral conductor

The amount of current present in a grounding electrode conductor during normal system operation is low because the Earth is a ____ and high impedance path for current

Poor conductor

_____Is defined as the conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served

Service

Grounding electrode conductor connections are required to be made using any but which of the following

Sheet metal screws, wrapping the conductor around the nut and bolt connection. Connections can be exothermic welding, listed clamps, listed lugs, listed pressure connectors, other listed means

If the service disconnecting means is made up of six disconnects in separate enclosures how many main bonding jumper is will be required for the service

Six

When installing grounding electrode conductor tabs from a common ground electrode conductor to each separate service disconnecting means enclosure, the minimum size required for the grounding electrode conductor Taps is based on the ...

Size of the largest ungrounded service conductor in each enclosure using table 250.66

Which of the following materials is not permitted as a grounding electrode conductor

Steel. Aluminum, copper, copper clad aluminum can be used

Which NEC table is used for sizing grounding electrode conductors

Table 250. 66

Grounding connections to the grounded conductor are generally not permitted on the load side of the service equipment enclosure

True

Grounding electrode conductors are generally required to be installed without a splice or joint

True

Grounding electrode conductors in sizes for AWG or larger must generally be protected where installed in locations where they are exposed to physical damage

True

If a main bonding jumper is a screw, the screw is always required to be identified using the color green

True

Protection for grounding electrode conductors can be achieved by using schedule 80 PVC and construction that is not fire rated

True

The grounded conductor is required to be routed to the service equipment along with its Associated ungrounded service conductors

True

The metal structure frame of a building shall be permitted to be used as a conductor to interconnect electrodes of the grounding electrode system, or it is permitted to be used as a grounding electrode conductor

True

The service disconnecting means used for a grounded Supply system is required to be listed as suitable for use as service equipment

True

Where a grounding electrode conductor is installed in a ferrous metal Raceway that is not electrically continuous from the service cabinet to the grounding electrode it must be made electrically continuous by bonding the contain grounding electrode conductor to both ends of the Raceway

True

Where a metal underground water pipe is used as a grounding electrode a bonding jumper is required for electrical continuity around any water meters , filtering equipment or similar equipment

True

Where service is supplied by a grounded system, the grounded conductor is required to be routed to the service disconnecting means enclosure and bonded to it

True

If the size of the largest ungrounded service conductor for a service is 3600 kcmil (6 kcmil conductors in parallel per phase) what is the minimum size copper wire type main bonding jumper required

500 kcmil copper

A single grounding electrode conductor installed in a ferrous metal Raceway must not exceed ___ of the cross-sectional area of the Raceway

53%

All grounding electrode conductors in sizes smaller than ____ must be protected from physical damage by installation and Raceway or cable armor

6 AWG

If a 400 amp service is grounded by connection to a single ground rod, what is the maximum size grounding electrode conductor required

6 AWG copper

What is the largest size required for a copper grounding electrode conductor that is a soul connection to a rod pipe or plate electrode

6 AWG copper

Where a service is supplied from a corner grounded system and the ungrounded conductors are size that 750 kcmil copper, what is the minimum size required for the grounded conductor

750 kcmil copper

A grounding electrode connection is required to be made at an <_______ location anywhere from the load end of the overhead service conductors, Service drop, Underground Service conductors, or service lateral up to and including the terminal or bus to which the grounded conductor is connected in the service disconnecting means

Accessible

The main bonding Jumper in a service disconnecting means enclosure can be in which of the following forms

All of the above. Bus, green screw, wire

Brendan electrode conductor connections are required to be accessible in all but which of the following locations

All of the locations to include buried electrode connection, concrete encased electrodes, exothermic welding connections to building steel under fireproofing material

If a service switchboard is supplied from an underground 240-volt system, which of the following markings are required on the switchboard

Caution: underground system operating 240 volts between conductors

Where do utility Transformer supplying a Services located outside the building a grounding connection is not required to be made outside a building or structure served by a grounded electrical service

False

Table 250.66 is used only for sizing grounding electrode conductors for alternating current systems

False. It is also used to size bonding jumpers of piping systems and exposed structural metal

Grounding and bonding components that correspond to service installation

Supply-side bonding jumper. Grounded conductor. Main bonding jumper. Grounding electrode conductor. Grounding electrode. Equipment grounding conductor

Which of the following is not one of the four necessary conductors in the grounding and bonding scheme for a service supplied by a grounded system

System bonding jumper. The four included are the equipment grounding conductor, the grounded conductor, the grounding electrode conductor, and the main bonding jumper

If a main bonding jumper is a wire type, what NEC table is generally used to size it

Table 250.102(C) (1)

Grounding electrode conductors must not be installed in length longer than ...

There is no length restriction in the NEC, it is a design issue

A grounding electrode conductor connect the system grounded conductor or equipment or both to a grounding electrode or to a point on the grounding electrode system

True

Which of the following characteristics are required for grounding conductors installed in parallel

They must not be smaller than 1 / 0 AWG generally They must be the same conductor material must be the same insulation type must be the same length same size terminated the same

A single grounding electrode conductor connected to the grounding electrode system is permitted for a service or individual grounding electrode conductors are permitted to be run from each electrode to the service equipment enclosure

True

Ground detectors are required to be installed on Services supplied by ungrounded systems and the ground detection sensing equipment must be connected as close as practicable to the service or source

True

A grounding electrode conductor installed in a non-ferrous metal Raceway such as aluminum conduit is not required to be bonded to both ends of the Raceway where it enters and emerges from the Raceway

True

A grounding electrode conductor is a conductor body that extends the grounding connection

True

A grounded conductor often the neutral, larger than 6 AWG is required to be identified by which of the following methods

American doctor that is a part of a listed service entrance cable assembly. A continuous white or gray outer finish. A distinctive white or gray marking at terminations that encircles the conductor. Three continuous white or gray stripes along its entire length on other than green insulation