Raceway and Conductors

Article 100 defines raceway as something that is designed expressly for holding wires, cables, or busbars and is a ____

Enclosed channel of metallic (or nonmetallic) materials. (100)

When planning what is needed for particular circuits, raceway fill calculations are prerequisite in determining ____

The size of raceway (introduction)

Raceway installed within drop ceilings must ____

Be grounded internally to support wires. (300.11) (B)

The maximum degrees of bends allowed between pull points equals the equivalent of ___

Four quarter bends (360 total) (342.24) (B)

A group of conductors that fit into one conduit may not fit into another type because different types of conduit may have different

Internal diameters (General provisions)

Bends must be made so that the conduit or tubing remains undamaged with its internal diameter

Basically undiminished (342.24) (A)

Rigid metal conduit RMC is a threadable raceway that is designed for the physical protection and routing of conductors and cables and ____

Has a circular cross section (100)

Contact of dissimilar metals (except for the combination of aluminum and steel) should be avoided whenever possible to lessen the potential for ____

Galvanic action (342.14)

The definition for intermediate metal conduit (IMC) and rigid metal conduit (RMC) is ____

Essentially the same (100)

Electrical metallic tubing must not be

Threaded (358.28) (B)

All cut ends of IMC and RMC must be

Reamed (342.28)-(344.28)

Electric metal tubing (EMT) provides protection from

All but severe physical damage. (358.12)

The minimum approved electrical trade size for EMT is ____

½ inch (358.20) (A)

According to the NEC, rigid PVC conduit is identified or comes in

Five types. (Only in I.G.)

PVC bends must be made so that the conduit remains undamaged and the internal diameter of the conduit is

Not reduced (352.24) (A)

To prevent conduit collapse or other deformities in the ends of larger conduits (2 to 6 in) you can ____

Install PVC plugs (only in I.G.)

Flexible metal conduit (FMC) is a raceway of circular cross section made of ____

A helically wound, formed, and interlocked metal strip. (100)

Listed flexible metal conduit can serve as a grounding means if certain conditions are met. One of these conditions is that the circuit conductors contained there in must be protected by overcurrent devices rated at ____

20 amperes or less. (250.118) (A) (5) (B)

Liquidtight flexible metal conduit (LFMC) is a raceway of circular cross section having a flexible metal core that is ___

Covered with an outer liquidtight, nonmetallic, sunlight-resistant jacket (100)

Surface nonmetallic raceway and their fittings must be designed so that sections can be mechanically coupled together and installed without subjecting the wires to

Abrasions (388.100)

Splices and taps are permitted within a surface metal raceway having a removable cover that

Remains accessible once installed (386.56)

Underfloor raceway dead ends must be

Closed (390.73)

Half-round and flat-top raceways not over 4 in. (100 mmm) in width must be covered by concrete (or wood) to a depth of ____

¾ inch (20 mm). (390.15) (A)

A header is a transverse metal raceway

For electrical conductors, providing access to predetermined cells of a precast cellular concrete floor. (100)

One method of housing and protecting electric wires (and cables) is by using wireways, which are ___

Troughs with hinged or removable covers (100)

For percentage conduit fill area calculations, a multiconductor cable, optical fiber cable, or flexible cord of two or more conductors is treated as

A single conductor (chpt 9) (Note 9)

Since all bends are counted, a conduit run with four 10 degree offsets and three 90 degree bends is equal to

310 degrees of bends

If it is not possible to support IMC within 3 ft of each conduit termination, an acceptable distance is ____

5 ft (342.30) (A)

The maximum support intervals for IMC, RMC, and EMT

Is every 10 ft

The support intervals for RMC conduit can be

10 ft or less (344.30) (B) (1)

For exposed vertical risers of RMC from industrial machinery or fixed equipment, the support distance can be increased

20 ft (344.30) (B) (3)

RMC conduit is permitted

To be used as an equipment grounding conductor (344.60)

PVC conduit is a type of ___

Rigid nonmetallic raceway (100)

The maximum trade size approved for PVC is ___

Not given (350.20) (B)

PVC must be fastened so that ___

Movement from thermal expansion or contraction is permitted (352.30)

When conductors or cables are rated at a temperature higher than the listed temperature rating of PVC conduit, ___

These conductors can be installed in PVC but cannot be operated at this higher temperature (352.10) (J)

A conduit containing one multi-conductor cable can be filled to ____

53% of the cross-sectional area. (Chpt 9) (Table 4) and (Table 1)

The minimum size of type IMC conduit that is required for a pull that includes fifteen stranded- 14 AWG conductors is ____

¾ inch IMC (Table C 4)

As a general rule, conductors connected in parallel to form a single conductor must ___

Be 1/0 AWG or larger (310.10) (A) (1) or (366.20)

Equipment termination provisions for circuits rated 100 amperes or less are used only for conductors rated ___

60 C (140 F) (110.14) (C) (1) (2)

A continuous white or gray outer finished or three continuous white strips on other than green insulation is required for insulated grounded conductors that are ___

6 AWG or smaller (200.6) (A)

Conductor temperature limitations can be compared to ___

The strength of a chain (I.G.)

In normally balanced circuits containing three or more conductors, the neutral conductor ___

Is not counted as a current-carrying conductor (310.15) (E)

In a raceway containing 12 current-carrying conductors, the conductor ampacity must be reduced to ___

50% of the listed conductor ampacity (Table 310.15) (C) (1)

The maximum approved trade size available in ENT is ___

2 ½ inches (362.20) (B)

When installing luminaire terminal connections, securing is not required for ENT in lengths ___

Not more than 6 ft (362.30) (A) (Note 1)

Two articles for the NEC that cover flexible metal conduit are ___

Article 348 (348)

The maximum trade size available in IMC is ___

Twelve inches. (342.30) (A)