see Type 9 enclosure in ANSI/NEMA 250-
1991, Enclosures for Electrical Equipment, and
ANSI/UL 1203-1994, Explosionproof and Dust-
Ignitionproof Electrical Equipment for Hazardous
(Classified) Locations.
Dusttight. Enclosures constructed so that dust will not enter under specified test conditions.
FPN: See ANSI/ISA-12.12.01-2000, Nonincendive Electri- cal Equipment for Use in Class I and II, Division 2, and Class III, Divisions I and 2 Hazardous (Classified) Locations.
Electrical and Electronic Equipment. Materials, fittings, devices, appliances, and the like that are part of, or in connection with, an electrical installation.
FPN: Portable or transportable equipment having self- contained power supplies, such as battery-operated equipment, could potentially become an ignition source in hazardous (classified) locations. See ISA- RP12.12.03-2002, Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class I Zone
2 and Class III, Division 1 and 2 Hazardous (Classified) Locations.
Explosionproof Apparatus. Apparatus enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby.
FPN: For further information, see ANSI/UL 1203-
1994, Explosion-Proof and Dust-Ignition-Proof
Electrical Equipment for Use in Hazardous
(Classified) Locations.
Hermetically Sealed. Equipment sealed against the entrance of an external atmosphere where the seal is made by fusion, for example, soldering, brazing, welding, or the fusion of glass to metal.
FPN: For further information, see ANSI/ISA-
12.12.01 -2000, Nonincendive Electrical Equipment
for Use in Class I and II, Division 2, and Class III,
Division J and 2 Hazardous (Classified) Locations.
Nonincendive Circuit A circuit, other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment is not capable, under I specified test conditions, of igniting the flammable gas-air, vapor-air, or dust-air mixture.
FPN: Conditions are described in ANSI/ISA-
12.12.01-2000, Nonincendive Electrical Equipment for Use in Class I and II, Division 2, and Class III,
Divisions I and 2 Hazardous (Classified) Locations.
Nonincendive Component. A component having contacts for making or breaking an incendive circuit and the contacting mechanism is constructed so that the component is incapable of igniting the specified flammable gas-air or vapor-air mixture. The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion.
FPN: For further information, see ANSI/ISA-
12.12.01-2000, Nonincendive Electrical Equipment
for Use in Class I and II, Division 2, and Class III, Divisions 1 and 2 Hazardous (Classified)
Locations.
Nonincendive Equipment. Equipment having electrical/ electronic circuitry that is incapable, under normal operating conditions, of causing ignition of a specified flammable gas-air, vapor-air, or dust-air mixture due to arcing or thermal means.
FPN: For further information, see ANSI/ISA-
12.12.01-2000, Nonincendive Electrical Equipment
for Use in Class I and II, Division 2, and Class III,
Divisions 1 and 2 Hazardous (Classified) Locations.