Electrical Installation - Chromalox CXH-A/B-03S Installation, Operation And Maintenance Instructions
Hazardous location forced-air heater
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5. Electrical Installation
Prior to Installation
1. Follow all safety guidelines in this manual when perform-
ing electrical wiring. Electrical installation should be con-
ducted by qualified personnel.
2. Model CXH-A/B heaters must be installed according to
the latest editions of the relevant parts of EN60079.
3. Disconnect power to unit prior to installation. If integral
disconnect is being serviced, ensure that feeder service
to disconnect is off.
4. Familiarize yourself with wiring diagram and wire con-
nection points. Wiring diagrams are located on the inside
cover of the main control enclosure. A general wiring dia-
gram is also included in this manual.
5. Ensure that proper cable glands and conduit connectors
have been selected. Cable, glands and conduit must be
installed per IEC/ATEX guidelines and must have proper
hazardous location listings.
Mains Connection
1. The conduit / cable entry for mains power are located on
the cast control enclosure.
2. To access the connection points for the mains power,
remove the (18) x M12 cover bolts on the main enclo-
sure. Once removed, the (3) mains wires should be con-
nected directly to the heater contactor or circuit breaker
(if equipped). See figures 5 and 6 for connection points.
Figure 5 – Mains Power Conduit/Cable Entries
6. 1"NPT Entry on top is factory equipped with a non-certi-
fied conduit plug
7. Unused conduit/cable entries must be plugged with cer-
tified stopper plugs.
8. Ensure that equipment is properly grounded using desig-
nated grounding lugs.
9. Modification of cable/conduit entries will void third party
listings and warranty.
10. Wiring should be selected based on amperages listed in
table D. Use only copper conductors and approved wir-
ing methods.
11. An external overcurrent device is required. Overcurrent
device should be sized based on heater amperages list-
ed in table D and should conform to installation location
requirements.
Figure 6 – Mains Power Connection
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