Weather-Rite UHA100 Installation, Operation & Service Manual - page 34
Manual is about: Tubular Unit and Utility Heaters
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10.4 UHA[X][S] Ladder Wiring Diagram
IMPORTANT:
For field wiring into service junction box, or if any of the original wire supplied with the heater
must be replaced, it must be replaced with wiring material having a temperature rating of at least 105° C
(221° F) and 600 volts. For supply connections, use No. 14 AWG or larger wires.