-
In industrial establishments where the
conditions of maintenance and supervision ensure that only licensed electrical
practitioner or non licensed electrical practitioner under the supervision of a
licensed electrical practitioner service the installation, flexible cords and cables shall be permitted to be installed in aboveground raceways that
are no longer than __ m to protect the flexible cord or cable from physical
damage
15
-
Exception: The nominal
insulation thickness for the ground-check conductors of Type G-GC cables
shall
not be less than __mm for 8.0 mm2 (3.2 mm dia.) and
not less than __mm for 5.5 mm2 (2.6 mm dia.)
-
(Portable Cables Over 600 Volts, Nominal)
The conductors shall be ___mm2 copper or larger and shall
employ flexible stranding
8.0 mm2 (3.2 mm dia.)
-
Fixture (luminaire) wires shall not be smaller than ___ mm2
0.75 mm2
-
Thermoplastic
insulated fixture wire shall be durably marked on the surface at intervals not
exceeding ___ mm. All other fixture wire shall be marked by means of a printed
tag attached to the coil, reel, or carton
600
-
What is the allowable ampacity of 1.25 mm2 fixture wires?
8A
-
Exception: Devices mounted so
they are accessible only to licensed electrical practitioner or non licensed
electrical practitioner under the supervision of a licensed electrical
practitioner shall be permitted without barriers, provided they are located
within an enclosure such that any energized parts within __ mm of the manual
adjustment or switch are covered by suitable barriers
150
-
Exception: The blades and
terminals supplying the load of a switch shall be permitted to be energized
when the switch is in the openposition where the switch is connected to
circuits or equipment inherently capable of providing a backfeed source of
power. For such installations, a permanent sign shall be installed on the
switch enclosure or immediately adjacent to open switches with the following
words or equivalent:
WARNING - LOAD SIDE TERMINALS MAY BE ENERGIZED BY BACKFEED
-
All switches and
circuit breakers used as switches shall be located so that they may be operated
from a readily accessible place. They shall be installed such that the center
of the grip of the operating handle of the switch or circuit breaker, when in
its highest position, is not more than __ mm above the floor or working
platform
1 980
-
A snap switch shall
not be grouped or ganged in enclosures with other snap switches, receptacles,
or similar devices, unless they are arranged so that the voltage between
adjacent devices does not exceed __ volts, or unless they are installed in
enclosures equipped with identified, securely installed barriers between
adjacent devices
300
-
Metal faceplates shall be of
ferrous metal not less than __ mm in thickness or of
nonferrous metal not less than __ mm in thickness
-
Faceplates of
insulating material shall be noncombustible and not less than __ mm in
thickness, but they shall be permitted to be less than __ mm in thickness if
formed or reinforced to provide adequate mechanical strength
-
Snap switches used
with open wiring on insulators shall be mounted on insulating material that
separates the conductors at least __ mm from the surface wired over
13
-
Knife switches rated
at over __ amperes at 250 volts or less, and at over __ amperes at 251 to
600 volts, shall be used only as isolating switches and shall not be opened
under load
-
(Knife switches)
To interrupt currents over 1 200 amperes at __ volts, nominal, or less, or over
600 amperes at __ to __ volts, nominal, a circuit breaker or a switch of
special design listed for such purpose shall be used
-
(AC General-Use Snap Switch)
A form of general-use snap switch suitable only for use on ac circuits for controlling the following:
(1) Resistive and
inductive loads, including electric-discharge lamps, not exceeding the ampere
rating of the switch at the voltage involved
(2) Tungsten-filament lamp loads
not exceeding the ampere rating of the switch at __ volts
(3) Motor loads not
exceeding __ percent of the ampere rating of the switch at its rated voltage
-
(AC/DC General-Use Snap Switch)
A form of
general-use snap switch suitable for use on either ac or dc circuits for
controlling the following:
(1) Resistive loads not exceeding the ampere rating
of the switch at the voltage applied
(2) Inductive loads not exceeding ___
percent of the ampere rating.of the switch at the applied voltage. Switches
rated in horsepower are suitable for controlling motor loads within their rating
at the voltage applied.
(3) Tungsten-filament lamp loads not exceeding the
ampere rating of the switch at the applied voltage if __-rated
-
Snap switches rated __
amperes or less directly connected to aluminum conductors shall be listed and
marked CO/ALR
20
-
( AC Specific-Use Snap Switches Rated for 347 Volts)
Snap switches rated 347 volts ac shall be listed and shall be used only for controlling the loads permitted by (d)(1) and
(d)(2).
(1) Noninductive Loads. Noninductive loads other than tungstenfilament
lamps not exceeding the ampere and voltage ratings of the switch.
(2) Inductive
Loads. Inductive loads not exceeding the ampere and voltage ratings of the
switch. The ampere rating of the switch shall not be less than __ amperes at a
voltage rating of 347 volts ac. Flush-type snap switches rated 347 volts ac
shall not be readily interchangeable in box mounting with switches identified
in 4.4.1.14(a) and 4.4.1.14(b)
15
-
Auxiliary contacts of
a renewable or quick-break type or the equivalent shall be provided on all
knife switches rated __ volts and designed for use in breaking current over
__ amperes
-
Receptacles and cord
connectors shall be rated not less than __ amperes, __ volts, or __ amperes,
__ volts, and shall be of a type not suitable for use as lampholders
-
Receptacles rated 20
amperes or less and designed for the direct connection of aluminum conductors
shall be marked ___
CO/ALR
-
Receptacles incorporating an isolated grounding connection intended for the reduction of
electrical noise (electromagnetic interference) as permitted in 2.50.7.17(d)
shall be identified by an orange
___ located on the face of the receptacle
triangle
-
Receptacles installed
on __- and __-ampere branch circuits shall be of the grounding type.
Grounding-type receptacles shall be installed only on circuits of the voltage
class and current for which they are rated, except as provided in Table
2.10.2.3(b)(2) and Table 2.10.2.3(b)(3)
-
(Replacement of Receptacles)
(3) Non–grounding-Type Receptacles. Where
grounding means does not exist in the receptacle enclosure,
a. A non–grounding-type receptacle(s) shall be permitted to be replaced with
another non–grounding type receptacle(s).
b. A non–grounding-type receptacle(s) shall be permitted to be replaced
with a ground-fault circuit interrupter-type of receptacle(s). These
receptacles shall be marked “____________.” An equipment grounding
conductor shall not be connected from the ground-fault circuit-interrupter-type
receptacle to any outlet supplied from the ground-fault circuit-interrupter
receptacle.
c. A non–grounding-type receptacle(s) shall be permitted to be
replaced with a grounding-type receptacle(s) where supplied through a
ground-fault circuit interrupter. Grounding-type receptacles supplied through
the ground-fault circuit interrupter shall be marked “____________” and “No
Equipment Ground__________.” An equipment grounding conductor shall not be connected
between the grounding-type receptacles
- "No Equipment Ground"
- "GFCI Protected"
- "No Equipment Ground"
-
After installation,
receptacle faces shall be flush with or project from faceplates of insulating
material and shall project a minimum of __ mm from metal faceplates
0.38
-
Receptacles, cord
connectors, and attachment plugs shall be constructed such that receptacle or
cord connectors do not accept an attachment plug with a different voltage or
current rating from that for which the device is intended. However, a __-ampere
__-slot receptacle or cord connector shall be permitted to accept a ___-ampere
attachment plug of the same voltage rating. Non– grounding-type receptacles and
connectors shall not accept groundingtype attachment plugs
-
Where conduits or
other raceways enter a switchboard, floor-standing panelboard, or similar
enclosure at the bottom, sufficient space shall be provided to permit
installation of conductors in the enclosure. The wiring space shall not be less
than shown in Table 4.8.1.5 where the conduit or raceways enter or leave the
enclosure below the busbars, their supports, or other obstructions. The conduit
or raceways, including their end fittings, shall not rise more than __ mm above
the bottom of the enclosure
75
-
What is the minimum
spacing b/w insulated busbars, their supports, or other obstructions from the
bottom of the enclosure?
200mm
-
For other than a
totally enclosed switchboard, a space not less than __ mm shall be provided
between the top of the switchboard and any combustible ceiling, unless a
non-combustible shield is provided between the switchboard and the ceiling
900
-
Panelboards shall be classified for the purposes of this
article as either lighting and appliance branchcircuitpanelboards or power
panelboards, based on their content.
A lighting and appliance branch circuit is a branch circuit that has a
connection to the neutral of the panelboard and that has overcurrent protection
of __ amperes or less in one or more conductors
30
-
A ___ and ___ branch-circuit panelboard is one having more than 10 percent of its overcurrent devices protecting lighting and appliance branch circuits.
-
A lighting and
appliance branch-circuit panelboard is one having more than __ percent of its
overcurrent devices protecting lighting and appliance branch circuits.
10
-
A ____ panelboard is one having 10 percent or fewer of its overcurrent devices
protecting lighting and appliance branch circuits
power
-
A power panelboard is one having __ percent or fewer of its overcurrent devices
protecting lighting and appliance branch circuits
10
-
Not more than ___ overcurrent devices (other than those provided for in the mains) of a lighting and appliance branch-circuit panelboard shall be installed in any one cabinet or cutout box
42
-
How many 3-pole
circuit breakers shall be installed in a panelboard?
8 (eight)
- 3-pole = 3 overcurrent devices
- 2-pole = 2 overcurrent devices
-
Each lighting and
appliance branch-circuit panelboard shall be individually protected on the
___ side by not more than __ main circuit breakers or __ sets of fuses
having a combined rating not greater than that of the panelboard
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