TN LLE HVAC and Air-Conditioning Circuits 2

Question 1

According to NEC Article 440, what is the maximum allowable voltage drop for the branch circuit supplying an air-conditioning compressor?

Accepted Answer

No specific limit in Article 440

Answer

3%

Answer

5%

Answer

10%

Question 2

What determines the minimum branch-circuit conductor size for a single hermetic refrigerant motor-compressor per NEC 440.32?

Accepted Answer

The nameplate rated-load current

Answer

125% of the rated-load current

Answer

The nameplate minimum circuit ampacity

Answer

115% of the locked-rotor current

Question 3

When an air-conditioning unit has both a compressor motor and a fan motor, how is the overcurrent protection device sized?

Accepted Answer

Based on the compressor rated-load current plus the full-load current of other motors, with OCPD sized per the largest motor's table value

Answer

Based on the largest motor only

Answer

Sum of all motor currents plus 25%

Answer

Based on the locked-rotor current of all motors combined

Question 4

What is the maximum distance a disconnecting means for an air-conditioning unit can be located from the equipment per NEC 440.14?

Accepted Answer

Within sight from and readily accessible

Answer

Within 25 feet

Answer

Within 50 feet

Answer

Adjacent to the unit only

Question 5

A room air conditioner connected to a 120-volt, 15-ampere branch circuit must not exceed what percentage of the circuit rating per NEC 440.62(B)?

Accepted Answer

80%

Answer

50%

Answer

100% if no other outlets exist

Answer

60%

Question 6

Per NEC 440.65, what additional protection is required for single-phase residential HVAC equipment rated at 250 volts or less?

Accepted Answer

Listed LCDI or AFCI protection cord set

Answer

Surge protection

Answer

AFCI protection

Answer

HACR-type circuit breaker