resi code mid term Flashcards
where motor overload protection is external to the appliance, the appliance shall be required to be _______ ?
marked
a unit switch or switches with a marked “off” position that is part of an appliance and that disconnects all ____ conductors shall be permitted as the disconnecting means where other means for disconnection are provided.
ungrounded
requirements for installing cord and plug connected built in dishwashers and trash compactors state that the receptacle shall be located in the space occupied by the appliance that the receptacle be accessible and that the cord shall be _____ feet long, measured from the face of the attachment plug to the plane of the rear of the appliance.
3-4 feet
the branch circuit rating of a water heater (appliance) that is continuously loaded shall not be less than ______ percent of the marked rating
125
in other than fixed electric space heating equipment an _____ shall supply central heating equipment
individual branch circuit
overcurrent protection for the branch circuit supplying an electric furnace shall be comply with the provisions of section _____ ?
210.20
422.11
426.52
665.11
422.11
one of the conditions which must be met for a room air conditioner to be considered a single motor unit requires the rating to be not more than ______ amps and 250 volts single phase
40
single phase cord and plug connected room air conditioners shall be provided with factory installed LCDI, HDCI, or ________ protection
AFCI
an _________ is defined as operation of equipment in excess of normal, full load rating or of a conductor in excess of rated ampacity that, when is persists for a sufficient length of time would cause damage or dangerous overheating
overload
a ______ fault condition represents a solid connection of relatively low or assumed zero impedance
bolted
OCPD ratings include all of the following except ?
ampere
impedance
interrupting rating
voltage
impedance
the ampere rating of a fuse or circuit breaker normally should not exceed the current carrying capacity of the ______ ?
conductors
the rating which defines the capacity of an OCPD to maintain its integrity when reacting to fault currents is referred to as its _______?
interrupting rating
the types of molded case circuit breakers include all of the following except _____?
electronic
magnetic only trips
thermal magnetic
thermal only trips
thermal only trips
for a circuit breaker to trip, due to an overcurrent, the _____ must sense the overcurrent and release ( unlatch ) the contacts
trip unit
with electronic trip molded case circuit breakers, a _____ is used in each current phase to monitor and reduce the current to the proper input level required by the electronic trip unit
current transformer (CT)
under normal operation, when a fuse is operating at or near it ampere rating, it simply functions as a ____?
conductor
the basic functional component of a fuse is the ___?
link
a ____ protective device is one which cuts off a fault current in less than one-half cycle
current-limiting
which voltage listed below cannot be used for the purposes of computing branch circuit and feeder loads
208Y/120
480Y/208
480Y/277
600Y/347
480Y/208
a continuous load is a load where the maximum current is expected to continue for _____ hours or more
3
it shall be permissible to apply a demand factor of _____ percent to the nameplate-rating load of four or more appliances fastened in place other than electric ranges, clothes dryers, space heating equipment, or air conditioning equipment, that are served by the same feeder in a one family two family or multifamily dwelling
75%
how to get the unbalanced load (neutral)
70%
a maintenance disconnecting means shall be provided and be accessible, located within ______ from all pools, spas, and hot tub equipment
sight
