MASTER OPENBOOK EXAM #5

The minimum size conductor permitted in parallel for elevator lighting is ___, provided the ampacity is equivalent to a #14 wire.

• #14

• #20

• #16

• #1/0

Conductors of light and power systems of all voltages may occupy the same enclosure or raceway ___.

• if less than 600 volts and if insulated for maximum voltage of any conductor within the enclosure or raceway

• if power system is over 600 volts and light system under 600 volts

• if power system is over 600 volts and individual circuits are AC

• in most instances without qualification

Transformers rated over ___ KV shall be in a vault.

• 10

• 12 1/2

• 25

• 35

The neutral of feeders supplying solid-state, 3-phase, 4-wire dimming systems shall be considered a ___ conductor.

• current-carrying

• noncurrent-carrying

• balanced

• isolated

Tubing having cut threads and used as arms or stems on light fixtures may not be less than ___ inches wall thickness.

• .020

• .025

• .040

• .015

Expansion fitting for nonmetallic wireway shall be provided to compensate for thermal expansion and contraction where the length change is expected to be ___ or greater in a straight run.

• .025 in

• .25 mm

• 6.36 in

• 6.36 mm

Types TPT, TS and TST shall be permitted in lengths not exceeding ___ feet when attached directly, or by means of a special type of plug, to a portable appliances rated at 50 watts or less.

• 8

• 10

• 15

• can’t be used at all

When determining the load on the “volt-amps per square foot” basis, the floor area should be computed from the ___ dimensions of the building.

• (a) inside

• (b) outside

• either (a) or (b)

• neither (a) nor (b)

Parts of electric equipment which in ordinary operation produce ___ shall be enclosed or separated and isolated from all combustible material.

 

I. molten metal  II. flames             III. sparks

• II only

• III only

• I and II only

• I, II and III

Location where combustible dust is normally in heavy concentrations are designated as ___.

• Class I, Division

• Class II, Division I

• Class II, Division II

• Class III, Division I