Question 1

Explain what the NEC requires to prevent lighting fixtures installed in suspended ceilings from falling.

Accepted Answer

NEC 410.36(B) requires that suspended ceiling framing members be securely fastened to each other, and must be securely attached to the building structure at appropriate intervals, and recessed luminaires must be securely fastened to the suspended ceiling framing members by bolts, screws, rivets, or special listed clips.

Question 2

In many cases, the use of a multiwire branch circuit can save money in that one 3-wire branch circuit will do the job of ____ branch circuits.

Accepted Answer

A multiwire branch circuit can effectively replace two 2-wire branch circuits by sharing a neutral wire, thus saving on wiring costs and materials.

Question 3

Roughing-in recessed luminaires that will be installed between ceiling joists can be quite a challenge. The conflict is between the ____ in. on center joists and the 24 in. square acoustic ceiling panels and their metal "T" bars and supports.

Accepted Answer

Ceiling joists are typically spaced 16 inches on center, which can create a challenge when installing recessed luminaires, especially when dealing with 24-inch square acoustic ceiling panels and their supports.

Question 4

Receptacles installed within 6 feet of a wet bar are required ____.

Accepted Answer

Receptacles within 6 feet of a wet bar are required to have GFCI protection, and they should not be installed face up in countertops or work surfaces.

Question 5

A fixture whip is ____ ft (1.2 to 1.8 m) long and is installed between the junction box and the luminaire.

Accepted Answer

The answer of A fixture whip is ____ ft (1.2...

Question 6

If there is no dropped ceiling, or if the drop is not as much as the height of the recessed luminaires, you will find that the center-to-center spacing of recessed luminaires will have to be in increments of ____________________ ft.

Accepted Answer

The answer of If there is no dropped ceiling, or...

Question 7

If marked "Suitable for Use in Suspended Ceilings," fluorescent luminaires are intended only for installation in suspended ceilings where the acoustical tiles, lay-in panels, and suspended grid are not part of the actual ____________________.

Accepted Answer

The answer of If marked "Suitable for Use in Suspended...

Question 8

Resistance of conductors may be found in NEC Chapter 9, ____________________.

Accepted Answer

The answer of Resistance of conductors may be found in...

Question 9

Lighting fixtures marked "Recessed Fluorescent Luminaire" ____ permitted to be installed in a suspended ceiling.

Accepted Answer

Recessed fluorescent luminaires are specifically designed to be installed in suspended ceilings, hence the marking indicates they are permitted for such installations.

Question 10

When connecting a multiwire (3-wire) circuit in the panel, care must be used to ensure that the two "hot"circuit conductors are connected to ____________________ in the panel.

Accepted Answer

The answer of When connecting a multiwire (3-wire) circuit in...

Question 11

Conductors in a ____ fixture whip in a typical suspended ceiling "lay-in" fluorescent luminaire must have a temperature rating as required on the label in the luminaire.

Accepted Answer

Conductor whips in a typical suspended ceiling "lay-in" fluorescent luminaire must be flexible to allow for easy installation and adjustment of the fixture.

Question 12

According to Ohm's law, the ____________________ across any device in a series circuit is directly proportional to the resistance of that device.

Accepted Answer

The answer of According to Ohm's law, the ____________________ across...

Question 13

All 15- and 20-ampere receptacles installed within 6 ft (1.8 m) of a ____ sink must be GFCI protected.

Accepted Answer

All 15- and 20-ampere receptacles installed within 6 feet of wet bar, laundry, and utility sinks must be GFCI protected for safety reasons, to prevent electrical shock hazards in areas where water and electricity are in close proximity.

Question 14

Recessed fluorescent luminaires are intended for installation in cavities in ceilings and walls and are to be wired according to Article ____________________.

Accepted Answer

The answer of Recessed fluorescent luminaires are intended for installation...

Quiz 17: Recreation Room