NCCER Ch 9 Review

The maximum size solid wire that should be terminated in pull boxes and disconnects is

• No. 6

• No. 8

• No. 10

• No. 12

Compact stranding is used

• when installing larger conduit sizes

• when decreasing the ampacity of an existing service

• with aluminum conductors

• in corrosive environments

The ampacity ratings of conductors can be found in

• NEC Chapter 1

• NEC Articles 348 through 352

• NEC Tables 310.16 through 310.21

• NEC Chapter 9

To determine the ampacity of copper conductors where conductors are used as a single conductor in free air at ambient temperatures of 30°C (86°F), use

• NEC Table 310.16

• NEC Table 310.17

• NEC Table 310.18

• NEC Table 310.19

Polyethylene (PE) is used primarily for

• the manufacture of TW and THW insulation

• insulation of control and communication wiring

• high-voltage cables

• high-temperature insulation

A type of thermoset insulation is

• RHW

• THW

• THHW

• PVC

What letter must be included in the marking of a conductor if it is to be used in a wet, outdoor application?

• D

• O

• I

• W

What service conductor may be bare, green, or green with a yellow stripe?

• The grounding conductor of a multi-conductor cable

• The neutral conductor of a multi-conductor cable

• The ungrounded conductor of a multi-conductor cable

• The high leg of a four-wire, delta-connected secondary

What are the colors of insulation on the conductors for a three-conductor NM cable?

• One white or gray, one red, and one black

• Two white or gray and one red

• One white or gray, one red, one black, and a grounding conductor

• One green, one white or gray, one blue, and a grounding conductor

In some cases, fixture wires may be used for

• 240V appliance wiring

• signaling wiring

• branch circuit wiring

• SE cable