A 300 HP, 480-Volt 451 amp, 3 phase motor is fed with 2 raceways. The minimum size of the equipment grounding conductor in each raceway shall be a __________ conductor if the Automatic Overcurrent Protective Device is rated at 500.

A 300 HP, 480-volt 451 ampere, 3 phase motor is fed with 1 raceway. The minimum size of the equipment grounding conductor shall be a __________ conductor if the Automatic Overcurrent Protective Device is rated at 500.

A 300 HP, 480-volt 451 ampere, 3 phase motor has a service with two, 4/0 Copper parallel conductors, the minimum grounded (neutral) size required for the main service can be two, __________ conductors. (Add circular mil areas together).

A 300 HP, 480-volt 451 ampere, 3 phase motor is again fed with 1 raceway. If the six paralleled type USE insulated conductors with 75 degree C terminations derated at 80% are used, at least __________ AWG sized wires are needed for the ungrounded (hot) conductors. (The 90 degree column can be used if the de-rating adjustment factors were used).

A 300 HP, 480-Volt 451 ampere, 3 phase motor is now fed with only 1 raceway. This requires all six ungrounded (hot) conductors to be installed in 1 conduit so they must be de-rated to __________.

A 300 HP, 480-volt 451 ampere, 3 phase motor is fed with 2 raceways. If type USE insulated paralleled conductors with 75 degree C terminations are used, at least __________ AWG sized wires are needed for the ungrounded (hot) conductors.

How many #6 AWG THW conductors can be installed in a 1 inch EMT conduit?

How many #4 AWG THWN/THHN conductors can you install in a 3/4″ trade size Liquidtight Flexible Nonmetallic Conduit (LFNC)?

A Class 2 or 3 remote-control signaling circuit conductor shall not be secured to __________.

A new type solid-state, 120-volt dimmer switch is installed in a junction box and it is also connected with a Class 2 circuit to a central microprocessor for control. The required 1/4″ inch separation for the low and high voltage conductors in the same enclosure can not be maintained when trimming out.

As a general rule, for a photovoltaic system, the ampacity of conductors and overcurrent devices shall not be less than __________ of the computed current.

Which is a true statement about a Solar Photovoltaic System?

The basic photovoltaic mechanically and electrically grouping of modules is called a(n) __________.

The #8 solid copper bonding conductor for a swimming pool is not required to be connected to the __________.

Article 640 covers equipment and wiring for __________.

Which is not considered an electric vehicle by the NEC?

Conductors installed in an escalator wellway can be installed in __________.

A feeder to an apartment building supplies power to 2 elevators with a 50% duty cycle. A __________ demand factor shall be applied.

Bare bulb lamps are installed behind a theater stage where they might come into contact with combustible scenery material. They need to be free from physical damage, have a guard, and/or provide an air space of at least __________ inch(es) to any combustible material.

How many grounded circuit conductors can be connected in a single hole in the neutral bus of a service-entrance panelboard?

How many equipment grounding conductors can be connected in a single hole in the neutral bus of a service-entrance panelboard?

When a large number of circuits are supplied in a single lighting and appliance panelboard, if there are heavy load conditions excessive temperatures may cause damage. The number of circuits supplied to one panelboard is limited to __________.

Which is an approved method of preventing tension or pull on a flexible cord to the connections?

Which is a true statement about strapping and supporting Electrical Metalic Tubing (EMT)?

A Rigid Metal Conduit is field threaded. A standard __________ inch taper per foot shall be used for the cutting die.

An underground Rigid Nonmetallic Conduit (RNC, PVC) feeder is considered a wet location, a #12 AWG Nonmetallic Sheathed Cable (Romex, NM) is to be installed in this raceway.

What is the allowable ampacity of 6, #8 THWN conductors in a conduit?

Which is not a true statement about running conductors in parallel?

As a general rule, a conduit can be used to support another conduit if __________.

A 200 ampere service with 2/0 copper service entrance conductors is grounded by running one continuous wire from a metallic piping system, then to 2 ground rods and then to the service neutral bar.

A copper grounding electrode conductor is ran along the surface of a building between 2 ground rods. It is not subject to physical damage and without covering or protection. What is the minimum size allowed?

A metal underground water pipe is used as the electrical system’s grounding electrode. It shall be supplemented with __________ more ground rod(s) if the first one has a resistance of more than 25 ohms to ground.

An AC transformer operating at 32 volts is required to be grounded __________.

After a ground rod clamp is installed, it should be accessible and if it is subject to physical damage it shall be protected __________.

The next standard overcurrent protective device size up can be selected on a single main for your conductors if the device is rated __________ amperes or less.

A commercial building has a power company pad mount transformer outside. There are 3 separate underground service laterals from the transformer to the structure, each of which terminates in a separate service disconnect.

Given that a separate building is supplied by a single branch circuit with an equipment grounding conductor from a common service.

Given that a separate building is supplied by a single branch circuit with an equipment grounding conductor from a common service.

A large feeder is run from one structure to another. Conductors are at the second structure in a gutter where taps are made into disconnects.

A large feeder is run from one structure to another. It is terminated at the second structure in a gutter where taps are made into disconnects. As a general rule, what is the maximum number of disconnects allowed?

When one building is on a single property with one owner and it is fed from another, how many feeders are allowed?

A barn has an opening for the loft on the second floor. A feeder or a branch circuit can not __________ the entrance to the building opening.

A store has an 18 foot wide Show Window. At least __________ receptacle outlet(s) shall be installed above the window.

What is the minimum size conduit for eight #12 AWG THW conductors?

How many # 6 AWG THW conductors can be installed in a 1 inch EMT conduit?

How many 1/0 THHN compact conductors can you install in a 1 1/2″ Electrical Metallic Tubing (EMT)?

How many 1/0 THHN conductors can you install in a 1 1/2″ Electrical Metallic Tubing (EMT)?

Which is not true of an electric sign requirement?

Every commercial building accessible to pedestrians is required to have one outlet at the entrance for a sign computed at…

In an agricultural building, what type of wiring methods may be used?

The general wiring method for a large auditorium can be…

Which is not considered a place of assembly?

A museum designed for ___ people or more is considered a place of assembly.

A luminaire (light fixture) used to illuminate a paint spray booth can be a fluorescent if…

A gasoline station requires…

In an aircraft hanger…

A commercial repair garage shall have…

In a commercial garage…

Rigid Metallic Conduit (RMC) is used in a Class I Division 1 location.

A Class I hazardous location J box…

What is the total required ampacity of conductors supplying 3 motors at 460 volts of 10, 15, and 20 HP, 3-phase induction type?

Conductors supplying one 200 HP and one 60 HP, 3 phase induction type motors at 480 volts, needs ____ total amperes for load.

A receptacle installed to serve a commercial pop machine outdoors…

An isolated grounding receptacle…

Electrical Nonmetallic tubing (ENT or blue smurf tube) is permitted…

Electrical Metallic Tubing (EMT) needs to be securely fastened…

Liquidtight Flexible Metal Conduit (LFMC, or Sealtight) can be used…

On an outside 100 ft. run of Rigid Nonmetallic Conduit (RNC, PVC), there is a potential temperature change of 100* F. to 0* (100* change). What is the expansion change in inches you can expect?

A bushing is required on Rigid Metallic Conduit (RMC) when it enters a standard box…

Which is a true statement for minimum burial cover requirements under 600 volts, under a parking lot?

A 1/0 THWN copper conductor is used with 75-degree terminations requiring the use of the 75-degree column to calculate ampacity. It is installed with a high ambient temperature in the attic of 96-104 degree F. What is the allowable ampacity?

Given a total load of 377 amps, with 75 degree terminations, 3 phase in a metal raceway with no neutral conductor, all the 6 parallel conductors are now installed in one raceway and need to be now derated to…

Given a total load of 377 amps, with 75-degree terminations, 3 phase in a metal raceway with no neutral conductor; parallel ____ conductors could be used in 2 separate raceways in a commercial installation for one piece of equipment.

When conductors are ran in parallel and an equipment ground is ran in each conduit, the equipment ground size is…

What is the allowable ampacity of #1 THHN copper conductor with 75-degree terminations?

Given a 3 phase 4 wire 400 amp commercial service, the neutral carries a major portion in harmonics and is considered current carrying requiring derating, the minimum size ungrounded conductors (hots) with 75 degree C terminations is…

Given a 3 phase 4 wire 400 amp commercial service, a neutral with no harmonic currents carrying only the unbalanced load, the minimum size ungrounded conductors (hots) with 75 degree C terminations is … (Actual load is less than 400 so a round up is needed)

2/0 AWG Copper wire installed in a ___ ft. vertical raceway requires support to prevent damage to the wire insulation and terminations.

In a conduit system…

Which is a true statement?

At a separate building supplied from a common service the interior metal water piping system needs to be bonded, the conductor size is based on…

What needs to be bonded?

What is the minimum size grounding electrode conductor to building steel when the service entrance conductors are parallel 250 KCMIL copper?

A 500 HP pump service is fed with 1000 Kcmil Copper. The minimum size grounding electrode conductor to a ground rod is…

When a metal underground water pipe is used as an electrode…

The general rule is you need at least 6 inches of free conductor length where it emerges at a junction box.

When an existing second building is supplied from the first, the neutral can be bonded when…

When using an effectively grounded metal water pipe to ground a separately derived system transformer, as a general rule….

A separately derived system transformer and secondary side disconnect neutral bar may be bonded…

When grounding a separately derived system (transformer)…

A ________ rated circuit breaker is not required to show its interrupting rating.

A commercial service may have up to ________ disconnects maximum, if they are grouped together.

A commercial building may have…

Service entrance conductors…

Can fused branch circuits be installed in a conduit with service entrance conductors?

As a general rule, unless an exception is met, when one structure is fed from another…

An outside pole light…

Where there is more than one voltage system at a building, like 480/277 and 120/208, which is a true statement?

A transformer is installed below an electrical panel…

THHN Conductors are terminated on a breaker, which is listed at 75 degree C. Which Column of Table 310-16 should be used to determine amperage rating?