Class 1 Division 1
(T/F) All boxes and fittings shall be approved for Class 1, Division 1.
True. (501.10(A)(3))
In Class 1, Division 2 locations, motors, generators, and other rotating electrical machinery shall comply with (1), (2), or (3). They shall also comply with (4) and (5), if applicable.
501.125(B)
Not Containing Liquid That Will Burn
501.100(A)(1)
Entering Enclosures
501.15(B)(1)
Enclosures shall be provided for lighting protective devices and for fuses. Such enclosures shall be permitted to be of the general-purpose type.
501.150(B)(3)
Type MI Cable terminated with fittings listed for the locations. Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.
501.10(A)(1)(2)
In Division 2 locations, cable seals shall be in accordance with ______ through _____.
501.15(E)(1), (E)(4). (501.15(E))
The attachment plug and receptacle are listed for use in Class 1, Division 2 locations and listed for use with flexible cords.
501.105(B)(6)(1)
(T/F) Spices and taps shall not be made in fittings intended only for sealing with compound; nor shall other fittings in which splices or taps are made be filled with compound.
True. (501.15(C)(4))
Enclosures for windings of transformers, solenoids, or impedance coils shall be permitted to be of the _________ type.
General-purpose. (501.125(B)(2))
Cable Seals, Class 1, Division 1.
501.15(D)
The heater shall not exceed ___ percent of the autoignition temperature in degrees Celsius of the gas or vapor involved on any surface that is exposed to the gas or vapor when continuously energized at the maximum rated ambient temperature.
80% (501.135(B)(1)(1))
For temporary portable assemblies consisting of receptacles, switches, and other devices, that are not considered portable utilization equipment but are individually listed for the location.
501.140(A)(5)
Where two or more explosionproof enclosures that require conduit seals are connected by nipples or runs of conduit not more than 900 mm (36 in.) long, a single conduit seal in each such nipple connection or run of conduit shall be considered sufficient if the seal is located not more than 450 mm (18 in.) from either enclosure.
501.15(A)(3)
Conduit seals shall be installed within ____ mm (18 in.) of the enclosure in each conduit entry into a pressurized enclosure where the conduit is not pressurized as part of the protection system.
450 mm (501.15(A)(2))
Metal conduit that contains no unions, couplings, boxes, or fittings, that passes completely through a Division 1 location with no fittings installed within ___ mm (12 in.) of either side of the boundary, shall not require a conduit seal if the termination points of the unbroken conduit are located in unclassified locations.
300 mm (501.15(A)(4)(Exception)
A thermal protector potted into a thermally protected fluorescent lamp ballast if the luminaire is identified for the locations.
510.130(B)(6)(Exception)
Enclosed within a chamber hermetically sealed against the entrance of gases or vapors.
501.150(B)(1)(Exception)(2)
Installing the seal as close as possible to the enclosure will reduce the problems with purging the dead airspace in the pressurized conduit.
501.15(A)(2)(Informational Note No. 1)
Control Equipment
501.17(F)(1)
In industrial establishments with restricted public access, where the conditions of maintenence and supervision ensure that only qualified persons the installation, for applications limited to ___ volts nominal or less...
600 volts (501.10(A)(2)(3))
Electrical resistance and skin effect heat tracing identified for Class 1, Division 2 locations.
501.135(B)(1)(Exception to (2))
The flexible cord does not exceed ___ mm (__ft), is of a type listed for ______ usage, or if listed for hard usage is protected by location.
900 mm; 3 ft; extra-hard usage (501.105(B)(6)(Exception 2)(2)
(T/F) Conduit systems passing from an enclosure or a room that is unclassified, as a result of pressurization, into a Division 2 location shall require a seal at the boundary.
False. (501.15(B)(2)(2)(Exception No. 3))
Resistors, resistance, devices, thermionic tubes, rectifiers, and similar equipment shall comply with 501.105(B)(3).
501.150(B)(2)