Midterm E3 Quiz 4

Indoor transformers of greater than __________ must be installed in a room of fire resistant construction.

112.5 kva

The minimum size disconnecting means allowed for a hermetic refrigerant motor-compressor is ________ of its name plate rated-load current.

115%

The ampacity of capacitor circuit conductors must not be less than __________ percent of the rated current of the capacitor.

135%

The rating of the attachment plug and receptacle must not exceed _________ at 250 volt for a cord and plug connected motor compressor and equipment

15 Amp

The branch circuit conductors, control apparatus and circuits supplying hermetic compressors refrigerant motor -compressors against over current due to short circuit and grounds. They are in addition to or amandatory of the provisions of article________.

240

Each doorway leading into a transformer vault from the building interior must be provided with a tight -fitting door having a minimum fire rating of _____ hours

3 hours

The size of a transformer vault shall not be less than _______ per KVA of the transformer capacity in service

3 inches squared

In Transformer Vaults door sills or curb must be of sufficient height to confine the oil from the largest transformer within the vault shall be provided and in no case shall the height be less than ________.

4"

A 250 volt single - phase room air conditioner shall be considered as a single - phase motor unit if its rating is not more than _______.

40 amps

Overcurrent protection of transformers shall comply with __________.

450.3 A, B, or C

The total rating a cord and plug connected room air-conditioner must not exceed _________ of the rating of a branch circuit where lighting outlets and other appliances or general use receptacle are also supplied

50%

Where a flexible cord is used to supply a room air conditioner the cord must not exceed _________ feet for a 208 or 240 volts unit.

6'

Where the room air conditioner is the only load on a circuit, the marked rating of the air conditioner must not exceed _______ of the rating of the circuit overcurrent device.

80%

__________ can be mounted on or within the air conditioning equipment.

Disconnecting means

Transformer vault ventilation openings shall be located as ________ as possible from doors, windows, fire escapes and combustible material.

far

Disconnecting means isn't required to be within sight from the equipment if the disconnecting means is capable of being _________ in the open position per article _______

individually lockable, 110.25

Indoor installations of dry-type transformers greater than 112.5 KVA must be in an approved transformer room unless the transformer(s). _______ .

is rated with Class 155 insulation or higher and separated from combustibles by fire resistant, heat insulating barrier

The disconnecting means for air-conditioning or refrigeration equipment must located ________ and readily accessible from the equipment

with sight from the unit