electrical #1

The drop conductors that pass over walkway must have clearance at least ___ft

• 3 ft

• 10 ft

• 12 ft

• 18 ft

The minimum current rating of 3-wire service for new one-family dwelling unit is_____.

• 60A

• 100A

• 125A

• 200A

. The min. vertical clearance for service drop conductors from decks & balconies is ________ .

• 3 ft

• 10 ft

• 12 ft

• 18 ft

The cross-sectional area of 2 wires in a conduit shall not exceed ____ % of the cross-section area of the conduit?

• 31

• 53

• 40

• none

. The minimum size for 200amp. of 3-wire service-entrance conductors for a dwelling unit is___

• #4THW

• #3THWN

• #2/0THWN

• #3/0THHN

What is the minimum size of copper EGC(grounding) allowed for 30A. 240V. water heater?

• #14 AWG

• #10 AWG

• #12 AWG

• #8 AWG

A 1-HP motor draws 1000 watts. What is its efficiency?

• 134%

• 50.5%

• 85.8%

• 74.6%

A single electrode consisting of a rod that does not have a resistance to ground of 25 ohm or less shall be augmented by additional electrode. Min. distance between electrodes is ________ ft.

• 5

• 6

• 10

• 12

Where the voltage between ungrounded conductors does not exceed 300V, and the roof has slope of 3 in. to 12in a clearance between conductors and roof ____ ft shall be permitted?

• 3

• 4

• 8

• 2

The AC(armored cable) shall be supported at least __ in. after the living box and distance between supports is __ in.

• 54,12

• 12,36

• 12,54

• 12,48