WIRING INSTALLATION
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
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.
5
North American
Canadian
European
International
Model
Purpose
Designation (s)
Designation (s)
Designation (s)
Designation (s)
E1
General Purpose
Generic NEMA 1, NEC
NEMA 1 IP32
IP32
Agency (s) UL/CSAus
CSA
CE: Manufacturer’s Declaration CE: Manufacturer’s Declaration
Ratings General Duty Only
General Duty Only
General Duty Only
General Duty Only
E4*
Moisture Resistant
Generic NEMA 4
NEMA 4
IP66
IP66
Agency (s) UL / CSAus
CSA
CE: Manufacturer’s Declaration CE: Manufacturer’s Declaration
Ratings Class I Div. 2, Groups B, C, D
Class I Div. 2, Groups B, C, D
II 3 G Ex nA II T1 to T6
Ex nA II T1 to T6
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
E2
Moisture/Explosion
Generic Explosion Resistant
Explosion Resistant
Explosion Resistant
Explosion Resistant
Resistant
Agency (s) CSAus
CSA
ATEX
IECex
Ratings Class I, Div. 1 Groups B,C & D Class I, Div. 1 Groups B,C &D
II 2 G EEx d IIB+H2 T1 to T6
Ex d IIB+H2 T1 to T6
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
E5
Moisture/Explosion
Generic
ITS
IECex
Resistant
Agency (s)
ATEX
Ex de IIC T1 to T6 540˚C, 600˚C
Ratings
II 2 G EEx de IIC T1 to T6,
540˚C, 600˚C
*WARNING:
Addition of a sparking device, such as a Thermostat, to an E4 housing will annul hazardous area rating.
Note:
Temps over T3
(200˚C) require stand-
offs for third party list-
ing. Refer to IECex &
ATEX certifs. for stand-
off dimensions
Note:
Temps over T4
(135˚C) require stand-
offs for third party list-
ing. Refer to IECex &
ATEX certifs. for stand-
off dimensions
Flange
ATEX IIC
Size
Labeling Reference
3" - 8"
CFP4
8" - 12"
CFP8
12" - 18"
CFP12
Terminal Housing, Exploded View - ‘Octobox’ Style
Third Party Certifications by Housing Style
