Master Electrician Exam – Questions With Proper
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Terms in this set (85)
A 150 kVA service transformer has a 180 amperes
480Y/277 volt 3-phase primary and a
208Y/120 volt, 3-phase secondary.
What is the approximate full-load
ampere rating of the primary of the
transformer?
Where a conductor is marked RHW-2 The conductor has a maximum operating temperate
on the insulation what does the "-2" of 90 degrees C.
represent?
For a grounded electrical system the overcurrent protective device
supplied by a feeder or branch circuit,
the equipment grounding conductor
shall be sized in accordance with _____.
,For lighting systems operating at 30- 25 amperes
volts or less, the output circuits of the
power supply are to
be rated for NOT more than _____.
Using the standard method of 50 kW
calculation, what is the demand, in kW,
on the ungrounded (line) service-
entrance conductors of an apartment
complex that has thirty-five (35)
electric ranges rated at 11.5 kW each?
Where a service riser is installed in a is permitted to be electrical metallic tubing (EMT)
wet location and contains THWN
insulated conductors, the wiring
method used _____.
What is the MAXIMUM distance 14 feet
between supports for straight
horizontal runs of trade size 1½ in.
threaded rigid metal conduit (RMC)?
Overcurrent protection of in accordance with Table 450.3(B)
transformers, of 600 volts or less, is
required to be sized _____.
A thermal barrier shall be required if 12 inches
the space between the resistors and
reactors, of 600 volts or less, and
combustible material is LESS than _____.
In movie theaters, all switches for in the lobby
controlling the emergency lighting
systems shall be located _____.
, Where a 90 ampere, 240-volt, single- 10 volts
phase load is located 225 feet from a
panelboard and is supplied with size 3
AWG copper conductors, determine
the approximate voltage drop on the
conductors. (K = 12.9)
Wiring methods associated with solar 10 inches
photovoltaic (PV) systems shall not be
installed within _____ of the roof decking
or sheathing except where directly
below the roof surface covered by PV
modules and associated equipment.
All metallic switchgear rated for over metallic shield of cables
600 volts shall be provided with a
grounding busbar for the purpose of
connecting the _____.
Conductors tapped from a feeder and one-third
supplying the primary of a transformer
need not have overcurrent protection,
where the length of the tap
conductors are not over 25 feet and
have an ampacity of at LEAST _____ of
the rating of the overcurrent device
protecting the feeder conductors.
Electrical equipment such as qualified persons
switchboards, panelboards, industrial
control panels, and motor control
centers, located in commercial and
industrial occupancies are required to
be field marked to warn _____ of
potential electrical arc flash hazards.
Solutions
Add to calendar
Play your way to mastery with fun games
Match Blocks Charms NEW
Terms in this set (85)
A 150 kVA service transformer has a 180 amperes
480Y/277 volt 3-phase primary and a
208Y/120 volt, 3-phase secondary.
What is the approximate full-load
ampere rating of the primary of the
transformer?
Where a conductor is marked RHW-2 The conductor has a maximum operating temperate
on the insulation what does the "-2" of 90 degrees C.
represent?
For a grounded electrical system the overcurrent protective device
supplied by a feeder or branch circuit,
the equipment grounding conductor
shall be sized in accordance with _____.
,For lighting systems operating at 30- 25 amperes
volts or less, the output circuits of the
power supply are to
be rated for NOT more than _____.
Using the standard method of 50 kW
calculation, what is the demand, in kW,
on the ungrounded (line) service-
entrance conductors of an apartment
complex that has thirty-five (35)
electric ranges rated at 11.5 kW each?
Where a service riser is installed in a is permitted to be electrical metallic tubing (EMT)
wet location and contains THWN
insulated conductors, the wiring
method used _____.
What is the MAXIMUM distance 14 feet
between supports for straight
horizontal runs of trade size 1½ in.
threaded rigid metal conduit (RMC)?
Overcurrent protection of in accordance with Table 450.3(B)
transformers, of 600 volts or less, is
required to be sized _____.
A thermal barrier shall be required if 12 inches
the space between the resistors and
reactors, of 600 volts or less, and
combustible material is LESS than _____.
In movie theaters, all switches for in the lobby
controlling the emergency lighting
systems shall be located _____.
, Where a 90 ampere, 240-volt, single- 10 volts
phase load is located 225 feet from a
panelboard and is supplied with size 3
AWG copper conductors, determine
the approximate voltage drop on the
conductors. (K = 12.9)
Wiring methods associated with solar 10 inches
photovoltaic (PV) systems shall not be
installed within _____ of the roof decking
or sheathing except where directly
below the roof surface covered by PV
modules and associated equipment.
All metallic switchgear rated for over metallic shield of cables
600 volts shall be provided with a
grounding busbar for the purpose of
connecting the _____.
Conductors tapped from a feeder and one-third
supplying the primary of a transformer
need not have overcurrent protection,
where the length of the tap
conductors are not over 25 feet and
have an ampacity of at LEAST _____ of
the rating of the overcurrent device
protecting the feeder conductors.
Electrical equipment such as qualified persons
switchboards, panelboards, industrial
control panels, and motor control
centers, located in commercial and
industrial occupancies are required to
be field marked to warn _____ of
potential electrical arc flash hazards.
