Deck 20: Low-Voltage Remote-Control

Question 1

To simplify connections, the conductor color-coding combinations are red-black-white, red-black-yellow-white, red- black-yellow plus an 18 AWG common , red-black-blue-white, and red-black-yellow-blue-white.

A)orange
B)white
C)blue
D)green

Answer 1

B

Question 2

When are low-voltage remote-control systems advantageous?

Answer 2

A method known as low-voltage remote control is selected because of the number of switches required and because it is desired to have extensive control of the lighting.Low-voltage remote- control systems are available ranging from very simple to very complex.These systems can provide control from multiple locations, automatic timing control, handheld (wireless) controls, occupancy sensors ("On" when motion is detected) and unoccupancy sensors ("Off " with predetermined time-delay when no one is in the room), ceiling and wall mounted sensors, photocell control for security ("On" at dusk, "Off " at dawn), and programmable controls.Federally mandated energy codes are an energy standard for buildings, such as the joint publication ANSI/ASHRAE/IESNA 90.1, the most widely adopted energy standard

Question 3

NEC 725.136(A) Class 2 circuits in the same raceway or cable as the wiring for light and power.

A)limits the number of
B)limits the voltage of
C)prohibits
D)mandates

Answer 3

C

Question 4

To install color-coded cables correctly throughout an entire installation, the wires are connected to the , switches, master controls, and panel, like color to like color.

A)conductor
B)relays
C)circuit
D)barrier

Question 5

The low-voltage relay is available in mounting styles.

A)one
B)two
C)three
D)four

Question 6

Switches are available in up to -switch combinations with features such as pilot light, lighted toggle, and being key-operated.

A)2
B)4
C)8
D)10

Question 7

If control requirements are very complex or extensive, a can be installed.

A)master sequencer
B)transistor
C)conventional switch
D)double relay

Question 8

Give one advantage and one disadvantage to installing low-voltage wiring in a raceway.

Question 9

The principle of operation of a master control with rectifiers is based on the fact that a rectifier permits current in direction(s).

A)only one
B)two
C)at least three
D)all

Question 10

What size knockout openings can relays be mounted through? What advantage does the plug-in relay have?

Question 11

identifying the switch's functions can be prepared and inserted in the switch cover.

A)Microchips
B)Directory strips
C)LEDs
D)Relays

Question 12

Most low-voltage, remote-control systems are wired with AWG conductors.

A)10
B)14
C)20
D)32

Question 13

What happens to a transformer in the case of an overload?

Question 14

The switch used in the low-voltage remote-control system is a normally open, , momentary contact switch.

A)double-pole, double-throw
B)single-pole, double-throw
C)single-pole, single-throw
D)double-pole, single-throw

Question 15

In a Class 2 circuit, because the power source of the circuit is limited, overcurrent protection is required.

A)fuse-based
B)circuit-breaker-based
C)no
D)minimum

Question 16

The is used in an installation where several relays are mounted in one enclosure.

A)gasket relay
B)double-throw relay
C)plug-in relay
D)standard relay

Question 17

Give an overview of how a relay-based low-voltage remote-control system operates.

Question 18

A low-voltage remote-control wiring system is operated.

A)resistor
B)capacitor
C)transistor
D)relay

Question 19

The switch used in the low-voltage remote-control system is approximately the size of a standard single-pole switch.

A)one-sixth
B)one-fourth
C)one-third
D)one-half

Question 20

Larger conductors should be used for long runs to minimize the .

A)current
B)voltage drop
C)transformer ratio
D)interrupt rating