Deck 19: Special-Purpose Outletswater Pump, Water Heater

Question 1

According to NEC 230.7, conductors other than service-entrance conductors are not permitted in the same raceway as the service-entrance conductors. However, what does Exception No. 2 permit?

Answer 1

Exception No. 2 permits load management control conductors that have overcurrent protection to be installed in the service raceway.

Question 2

A disconnect need not be in sight of motor and driven machinery if the disconnect can be ____________________ in the open "OFF" position.

Answer 2

individually locked

Question 3

Water pumps that contain all required starting and protection components and connect directly to the pressure switch with no above-ground controller, are often called ____________________ pumps.

Answer 3

2-wire
2 wire
two-wire

Question 4

Explain why heating elements in water heaters are frequently rated 250 volts for operation on 240-volt circuits.

Question 5

Submersible pump cable supplied with well pump assemblies ____ also suitable for direct burial.

A) is
B) is not

Question 6

Motor disconnects are required to be ____.

A) universal (weatherproof) type
B) dual-voltage
C) horsepower-rated
D) listed as motor controllers

Question 7

If a 115/230-volt, dual-voltage motor has a full-load current of 8 amperes at 230 volts, the same motor connected for 115-volt operation will draw ____________________ amperes.

Question 8

The Code requirements for standard resistance-type electric water heaters are found in Article 422. Because heat pump water heaters contain a hermetic refrigerant motor compressor, their Code requirements are found in Article ____________________.

Question 9

When a non-motor-operated electrical appliance is not marked with its overcurrent protective device rating, NEC 422.11(E) states that the branch circuit overcurrent protection shall be ____.

A) 20 amperes where the appliance rating does not exceed 13.3 amperes
B) calculated using the appliance formula in Chapter 9
C) 150 percent of the appliance rating when over 13.3 amperes
D) both a and c

Question 10

Where the values of branch-circuit protection required for motors according to Table 430.52 do not correspond to standard ratings as listed in NEC 240.6, the next ____ rating is permitted to be used.

A) higher
B) lower
C) fuse
D) none of the above

Question 11

Because a water heater represents a continuous load, the branch circuit must be rated not less than ____ percent of the water heater nameplate rating.

A) 80
B) 100
C) 125
D) 225

Question 12

An individual motor disconnect must be in sight of the motor controller and must disconnect the controller. The NEC definition of in sight means that the controller must be visible and not more than ____ from the disconnect.

A) 50 ft (15 m)
B) 75 ft (22.5 m)
C) 25 ft (7.5 m)
D) none of the above

Question 13

Dual-voltage-rated pump motors are rated ____.

A) 115/230
B) 120/240
C) all of the above
D) none of the above

Question 14

Most installations require motor overload protection not to exceed ____________________ of the motor's full-load current rating.

Question 15

Should it be required to run a pump's circuit underground for any distance, it is necessary to install Type UF or Type USE cable or ____, and then make up the necessary splices in a listed weatherproof junction box

A) a raceway with suitable conductors
B) connect it to pole lighting standard grounding lugs
C) other cable a minimum of 12 inches deep
D) both a and c

Question 16

NEC 430.103 requires that a disconnecting means for a motor shall ____ ungrounded conductors.

A) open all
B) open no

Question 17

The NEC permits overcurrent protective devices for individual branch circuits to appliances to be sized up to 150 percent of the appliance ampere rating. However, if the 150 percent sizing does not correspond to a standard size fuse or circuit-breaker, then what size is permitted?

Question 18

Briefly explain what is meant by the electric utility program known by all of the following names: "time of day," "time of use," and "off-peak."

Question 19

The overload protection for a motor might be thermal overloads (sometimes called ____________________) in the controller, electronic sensing overload devices, built-in thermal protection, or time-delay fuses.

Question 20

Article 430 contains requirements for motor installations. The section that requires a motor disconnect to be within sight of the motor or capable of being locked is ____________________.

Question 21

UL requires that the power (wattage) input must not exceed ____ percent of the water heater's nameplate rating.

A) 105
B) 110
C) 125
D) 150