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Wiring
Use only Type E4 or E2 terminal enclosures in hazardous location
environments as applicable. The proper use of Type E4 or E2 ter-
minal enclosures on electric heaters located in hazardous areas
requires that all electrical wiring comply with National Electrical
Code (NEC) and/or International Electric Code requirements for
hazardous locations.
Wiring Entrance Locations
Flange sizes 6" or larger that use Chromalox E1 or E4 offer several
convenient options for conduit wiring & location. The housing is
equipped with two removable service entrance plates for installation
of wiring. Any or all of the six sides can be used for wiring locations.
Refer to exploded view drawing. The housing can also be rotated (by
removal from flange) to allow for more position possibilities. To
install service entrance holes, simply remove the side Allen screws
and use the centering depression to drill the appropriate size hole.
Reinstall the gasket(s), if applicable, and service entrance plates by
tightening the Allen head screws to 4-5 in-lbs. The 'Octobox' style of
housing can be removed for ease of access to element bussing or to
better locate the power conduit(s) entry point. To accomplish, sim-
ply remove the Allen-head screws on the outside of the housing.
When reinstalling, be sure to properly align gasket, if applicable, and
tighten to 40-50 in-lbs.
Tip for reinstalling gaskets
Place Allen Head screws through metal covers and gentle push gas-
ket hole over the threaded screw. This will allow the gasket to stay
in place while tightening the cover.
Maximum Temperatures
Safe operation in a hazardous location requires the maximum oper-
ating temperatures of all exposed surfaces of the heater including
temperatures on the outside of the vessel, piping, flanges, screw
plugs, enclosures and other heat conducting parts be limited. The
flammable liquids, vapors or gases present determine the maximum
Third Party Certifications by Housing Style
Model
Purpose
Generic NEMA 1, NEC
E1
General Purpose
Agency (s) UL/CSAus
Ratings General Duty Only
Generic NEMA 4
E4*
Moisture Resistant
Note: Temps over T3
Agency (s) UL / CSAus
(200˚C) require stand-
Ratings Class I Div. 2, Groups B, C, D
offs for third party list-
ing. Refer to IECex &
ATEX certifs. for stand-
off dimensions
E2
Moisture/Explosion
Generic Explosion Resistant
Resistant
Agency (s) CSAus
Note: Temps over T4
Ratings Class I, Div. 1 Groups B,C & D Class I, Div. 1 Groups B,C &D
(135˚C) require stand-
offs for third party list-
ing. Refer to IECex &
ATEX certifs. for stand-
off dimensions
Generic
E5
Moisture/Explosion
Agency (s)
Resistant
Ratings
Flange
ATEX IIC
Size
Labeling Reference
3" - 8"
CFP4
8" - 12"
CFP8
12" - 18"
CFP12
*WARNING: Addition of a sparking device, such as a Thermostat, to an E4 housing will annul hazardous area rating.
WIRING INSTALLATION
North American
Designation (s)
NEMA 1 IP32
CSA
General Duty Only
NEMA 4
CSA
Class I Div. 2, Groups B, C, D
Class II Division 2,
Class II Division 2,
Groups E, F: 200˚C (T3)
Groups E, F: 200˚C (T3)
Group G 165˚C (T3B)
Group G 165˚C (T3B)
Class I Zone 2 AEx nA II
Class I Zone 2 Ex nA II T1 to T6
T1 to T6
Explosion Resistant
CSA
Class II, Div. 1 Groups E, F & G Class II, Div. 1 Groups E, F & G
Class I Zone 1
Class I Zone 1
AEx d IIB + H2 T1 to T6
Ex d IIB + H2 T1 to T6
surface temperature permitted in any hazardous location. The end
user or purchaser of the electric heating equipment is responsible for
determining the proper classification of an area and for providing
Chromalox with hazardous area specifications and requirements for
proper equipment design. (NEC and IEC provide guidelines for
evaluating and classifying hazardous locations.)
Safety Devices
Approved pressure and/or temperature limiting controls must be
used on electric heaters and heating elements to ensure safe opera-
tion in the event of system malfunctions.
Note: Locations including hydrogen gas require additional conduit
seals and thread engagement.
Terminal Housing, Exploded View - 'Octobox' Style
Canadian
European
Designation (s)
Designation (s)
IP32
CE: Manufacturer's Declaration CE: Manufacturer's Declaration
General Duty Only
IP66
CE: Manufacturer's Declaration CE: Manufacturer's Declaration
II 3 G Ex nA II T1 to T6
Explosion Resistant
ATEX
II 2 G EEx d IIB+H2 T1 to T6
ITS
ATEX
II 2 G EEx de IIC T1 to T6,
540˚C, 600˚C
5
International
Designation (s)
General Duty Only
IP66
Ex nA II T1 to T6
Explosion Resistant
IECex
Ex d IIB+H2 T1 to T6
IECex
Ex de IIC T1 to T6 540˚C, 600˚C
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