electricians test - part 3
what's the minimum contact conductor size where the distance between the strain insulators or clamp-type supports is less than 30 ft, for a crane or hoist
6awg. table 610.14
to meet NEC regulations, fuses or circuit breakers connected in parallel must be
Factory assembled in parallel. 240.8
a conductor installed on the supply side of a service that ensures the required electrical conductivity between metal Parts is known as
bonding jumper, supply side. 250.2
what type of front must be used for panel board enclosures
dead front. 408.38
when Blades of knife switches are open they must be
deenergized. 404.6
in legally required standby systems what Audible and visual signal devices shall be provided
derangement, carrying load, not functioning, and ground fault. 701.6
the pump wiring for fire pumps must be what type cable
type MC cable with an impervious covering or type Mi cable. 695.6
what's the duty cycle multiplication Factor for resistance welder with a 40% duty cycle
.63. table 630.31
what is the feeder demand factor for 10 or more elevators
.72. table 620.14
what is the minimum time storage batteries used as a source of power for emergency systems shall maintain the total load
1.5 hours without the voltage applied to the load falling below 87% of normal. 700.12
what is the maximum voltage drop for a branch circuit supplying sensitive electronic equipment
1.5%. 647.4
conductors maybe tapped, without overcurrent protection at the tap, to a feeder if the ampacity of the tap conductor is not less than the combined computed loads on the circuit supplied by the tap conductor. the tap conductor cannot exceed what length
10 ft. 240.21
panelboards installed in healthcare facilities and serving the same individual patient vicinity must be bonded together with copper conductors not smaller than
10 gauge. 517.14
what is the minimum interrupting rating of an unmarked branch circuit fuse
10000 Amps. 240.60
a circuit breaker with a slash rating of 120/240 volts is rated for what voltage to ground
120 volts to ground. 240.85
what is the maximum overcurrent rating that may be used for dimmer controls for stage lighting in theaters
125% of the dimmer rating. 520.25
where a power supply enters a recreational vehicle what is the maximum distance the supply may run inside a vehicle before it must be provided with overcurrent protection
18 in. 551.30
a metal pole supporting a light fixture shall have an accessible handhole not less than
2 by 4 in. 410.30
what is the maximum overcurrent protection allowed on circuits feeding stage equipment such as footlight or border lights
20 amps. 520.41
auxiliary gutters must not be filled to greater than
20%. 366.22
the maximum overcurrent protection in a panel board with snaps switches rated at 30 amps or less is
200 amps. 408.36
the working clearance between live parts for a system operating at 480 volts with exposed live Parts on one side and grounded Parts on the other side is
3 ft 6 in. table 110.26
other than storable pools, how long can a flexible plug-in cord be for swimming pools, fountains and similar installations
3 ft. max 680.7
what's the maximum overcurrent protection for a 24 amp dimmer
30 amps. 24*1.25. 520.25
what is the highest current rating of an Edison base plug fuse
30 amps. 240.51
what is the maximum voltage allowed between adjacent snap switches receptacles and similar devices in an enclosure
300 volts. 404.8
what's the demand factor for services and feeders for an electrified truck parking space with a climate temperature zone of 6B
34%. table 626.11
what's the minimum ventilation required for an electric vehicle charging system with a branch circuit rating of 20 amps at 120 volts
49 cubic feet per minute. table 625.29
what is the allowable ampacity for instrumentation tray cable type ITC
5 amps, except for 22 gauge which is 3 amps. 727.8
what is the highest position the operating handle of a safety switch or circuit breaker may be located above the floor or working platform under normal working conditions
6 feet 7 inches. 404.8
the minimum size copper equipment grounding conductor for a 200 amp circuit is
6 gauge. table 250.122
the largest standard rating for fuses and inverse time circuit breakers is
6000 amps. 240.6
what is the minimum lampholder rating for circuits and equipment operating at less than 50 volts
660w. 720.5
a circuit feeding a single phase motor with full load current rating of 40 amps requires the following dual element time delay fuse
70 amps. table 430.52
what is the maximum gauge wire for a type AC cable in manufactured wiring systems
8 AWG. 604.6
what is the adjustment Factor for a 1/0 THHN conductor in conduit with 5 other current-carrying conductors
80%. table 310.15b3a
what is the maximum length of a cord in a cord and plug connection for office furnishings
9 ft. 605.5
what area is not covered in the cell line working zone for electrolytic cells
Beyond walls, floors, roofs, partitions, barriers or the like. 668.10
what source of energy is required for a pipe organ
Transformer type rectifier, the DC potential of which shall not exceed 30 volts DC. 650.4
does industrial Machinery require a disconnect
a machine shall be considered as an individual unit and therefore shall be provided with disconnecting means 670.4
what is the minimum size branch circuit conductor used in electroplating
ampacity not less than 125% of the total connected load. 669.5
what must be provided when a 4 gauge or larger conductor enters a panelboard
an insulated bushing. 300.4
how long is a momentary rating for X-ray equipment
an operating interval that does not exceed 5 Seconds. 660.2
what is the maximum number of overcurrent devices permitted in a panel board
as many as will fit. panelboards are required to have a physical means to limit overcurrent devices. 408.54
class 1, 2, and 3 remote control signaling and power limited circuits shall be identified
at Terminal and Junction locations in a manner that prevents unintentional interference with other circuits during testing and Servicing. 725.30
where must an overcurrent device be located in a circuit
at the point where the conductor receives its Supply. 240.21
where must overcurrent devices in non-power limited fire alarm systems be located
at the point where the conductor to be protected receives its Supply. 760.45
where must metal panel boards be protected against corrosion
both inside and outside. 312.10
panel boards must be mounted in
cabinets, cut out boxes or enclosures design for the purpose. 408.38
what type of control panels are required for induction and dielectric heating equipment
control panel Shall be of deadfront Construction. 665.21
what what is the minimum thickness of the metal enclosure for electric signs and outline lighting
copper or aluminum sheeting at least .02" steel at least .016. 600.8
Edison base plug fuses may be used only in
existing installations under specified conditions. 240.51
what type of overcurrent device is required on a busway system or a branch circuit or sub feeder is tapped from the main busway
externally operated circuit breaker or externally operable fusible switch. 368.17
how must direct current conductors used in electroplating systems be protected
fuses or circuit breakers, a current sensing device that operates a disconnecting means. or other approved means. 669.9
plug fuses of 15 amps and lower rating must be identified by what type of window configuration
hexagonal. 240.50
circuit breakers used as switches for HID lighting must be listed and marked as
hid. 240.83
constant voltage generators, except AC generator exciters, must be protected from overload by
inherent design, circuit breakers, fuses, protective relays. 445.12
what must the continuous neutral current rating be for an auto Transformer used to create a 3-phase 4 wire distribution system from a 3-phase 3-wire ungrounded system
it must be sufficient to handle the maximum possible neutral unbalanced load. 450.5
multiwire Branch circuits May Supply only
line to neutral loads. 210.4
the panel's of switchboards must be made of
moisture resistance and non-combustible material. 408.50
what overcurrent requirements are specified for grounding conductors
no overcurrent device is permitted in series with any conductor that is intentionally grounded. 240.22
may conduit bushings constructed wholly of insulating material be used to secure a Raceway or a fitting
no. 300.4
are 2 wire DC circuit's in integrated electrical systems required to be grounded.
no. 685.12
fused safety switches must not have the fuses connected in
parallel. 404.17
what conductor materials are allowed for fire alarm systems
solid or stranded copper. 760.49
a circuit breaker with a slash rating is permitted to be installed in which of the following systems
solidly grounded system 240.85
an insulated grounded conductor shall have an insulation that is
suitable for use as an ungrounded conductor. 200.2
where the allowable current rating of a busway does not correspond to a standard rating of overcurrent device, what rating is permitted
the next higher rating. 240.4
a cut-out box installed in a damp and wet location Shall be
weatherproof. 312.2
what type of connectors are required for an electrically driven or controlled irrigation machine
weatherproof. 675.17
what is the minimum size equipment grounding conductor for applications around natural and artificially made bodies of water
12 gauge copper. 682.31
a non time delay fuse protects a circuit with a single phase 40 FLA motor what size fuse should be used
120 amp. table 430.52
a grounding autotransformer is used to create a 3-phase 4 wire distribution system from a 3-phase 3-wire ungrounded system. at what percent must the overcurrent device be set to trip in case of an overload
125% of the Transformers continuous current per phase or neutral rating. 450.5
overcurrent devices for an auto Transformer must not have a rating exceeding what percentage of the full load input current
125%. 450.4
the maximum size fuse allowed to protect a 14 gauge thw conductor is
15 amps. 240.4d3
the maximum rating of overcurrent devices protecting panelboard instrument circuit is
15 amps. 408.52
mobile home disconnecting means shall be located not less than how many feet above finish grade or working platform
2 feet. 550.32
what's the minimum number of circuits allowed to feed a household type Appliance with surface heating elements having a maximum demand of more than 60 amps
2. 422.11
In busway installations, fused switches and circuit breakers may be located at the same level as the busway provided
a suitable means is provided to operate the device from floor level. 404.8
in a panel board how many overcurrent devices are counted in one 2 pole circuit breaker
a two pole circuit breaker takes up two spaces and is counted as two overcurrent devices. 408.54
metal panel board cabinets and the related frames must be
in physical contact with with each other. 408.40
each Auto Transformer 600 volts or less shall be protected by an individual overcurrent device. how must this device be connected in relation to the auto Transformer
in series with each ungrounded input conductor. 450.4
in an auto Transformer overcurrent devices shall not be installed
in series with the shunt winding. 450.4
feeder distribution equipment for critical operations Power Systems Shall be located
in spaces with a two hour fire resistance rating and above the hundred year flood plain. 708.11
do guy wires used to support turbine towers for small wind electric systems require an equipment grounding conductor
no. 694.40
a transfer switch is required for a fuel cell system attached to
non grid interactive systems that use utility grid backup. 692.59
supplementary overcurrent devices shall
not be required to be readily accessible. 240.10
what is the minimum ampacity of branch circuit conductors supplying information technology equipment
not less than 125% of the total connected load. 645.5
what is the maximum overcurrent device rating for each resistance welder connected to an electrical system
not over 300% of the rated primary current of the welder. 630.32
what type of optical fiber cables are allowed to be used in fabricated ducts
ofnp and ofcp. table 770.154
optional standby systems are defined as
systems intended to supply power to public or private facilities or property where Life Safety does not depend on the performance of the system. 702.2
rated ampacity of conductors and overcurrent devices of a feeder for two or more Branch circuits supplying x-ray units shall not be less than 100% of the momentary demand rating of the two largest x-ray apparatus Plus
20% of a momentary ratings of other x-ray apparatus. 660.6
audio system equipment supplied by a branch circuit power must be how many feet above the prevailing or tidal high water mark
5 feet. 640.10
what is the maximum rating of overcurrent devices used to protect circuits feeding infrared lamp heating appliances in commercial and Industrial applications
50 amps. 422.11
omission of overcurrent protection is permitted at points where busways are reduced in size provided that the smaller busway length does not exceed what distance
50 ft. 368.17
in healthcare facilities what is the minimum percentage allowed for the momentary ampacity of the equipment when sizing branch circuit conductors and overcurrent protection
50%. 517.73
what is the minimum wire bending space allowed in a panel board being fed with parallel pairs of 2/0 conductors entering the enclosure through the wall opposite the terminals
6 in. table 312.6b
one combination that is considered by the NEC to be equivalent to an overcurrent trip unit is
current Transformer and overcurrent relay. 240.15
if safety switches are horsepower rated the rating must be marked on the switch as well as
current and voltage rating. 404.15
what is the maximum overcurrent device rating that may be used for an arc welder
not over 200% of the rated primary current of the welder. 630.12
a feeder tap less than 25 feet long does not require overcurrent protection at the tap if the ampacity of the tap conductor is at least
one-third the rating of the overcurrent device protecting the feeder conductors. 240.21
how shall busbars be mounted in a panel board
rigidly. 408.51
receptacles in patient care areas of pediatric locations must be
tamper-resistant. 517.18
the bus or conductor rating of interconnected electric power production sources is sized so
the sum of the ampere ratings of the overcurrent devices shall not exceed 120% of the rating in the bus bar. 705.12
when installing a grounding conductor in a panel board each grounded conductor must be terminated in an individual terminal that is not also used for another conductor unless
the terminal is identified for use with more than one conductor. 408.41
the minimum spacing allowed between bare metal surface mounted, current-carrying parts of opposite polarity in a panel board with voltage not exceeding 125 volts is
three-quarter inch. table 408.56
what is a blocking diode used for in a solar photovoltaic system
to block reverse flow of current into a photovoltaic Source circuit. 690.2
when is it permissible to install two wires under the same set screw in a neutral
when it is identified. 110.14
in other than a dwelling, switchboard and panel boards must be marked to indicate
where the power supply originate. 408.4
