ELECTRICAL DETAILS NEVER install a cable designed for a 120 V power source on a 240/208 V power source.
• A dedicated circuit is recommended for each application, but a circuit supplying one or more fixed room heaters may be used, as long as its rating does not exceed 30 amperes, that the total current from all branch circuits does not exceed 80% of the circuit breaker limit, and the branch circuit cable reaching the thermostat junction box is of the same conductor size as the main circuit. De-energize all power circuits before installation and servicing.
• A thermostat control device (i.e., thermostat or power module) is required for each heating cable system installation.
• A Class A (5 mA) ground fault circuit interrupter (GFCI) is required for each circuit. The Schluter®-DITRA-HEAT-E thermostats and power modules include a GFCI, thus a GFCI circuit breaker is not required when using these thermostats.
• In Canada, according to Rule 62-202 of the Canadian Electrical Code 2021, a thermostat or an applicable temperature control device is required for each enclosed area where a heating cable is installed. A heating cable is permitted to extend into adjacent rooms and be controlled by a single temperature control device or thermostat. As necessary, please verify your installation plan with local inspector to determine their interpretation of the rule and whether or not your cable layout is approved prior to setting tile.
• In the USA, according to Rule 424.38 (A) of the National Electrical Code 2020, heating cables may extend beyond the room in which they originate. In previous editions of the National Electrical Code (NEC), extending heating cables beyond the room was not permitted. Please verify with your local inspector to determine which edition of the NEC is being enforced by the local Authority Having Jurisdiction (AHJ). Also, please verify approval of your cable layout prior to setting tile. Additionally, installations of heating cables in dressing rooms or large walk-in closets are subject to approval by the local AHJ.
• Mark the circuit breaker in the electrical panel that is connected to the DITRA-HEAT floor warming system using the identification sticker provided. Additional stickers provided may be placed on the electrical panel door.
• Do not connect the DITRA-HEAT-E thermostats to AFCI circuit breakers. An AFCI circuit breaker may cause the thermostat to trip for other than safety reasons.
• The heating cable ground braid must be bonded to ground.
• Threading the cold lead from the floor to the thermostat junction box needs to be done within an approved raceway or conduit. The conduit is required to begin at no greater than 2 inches (50 mm) from the floor. The opening in the horizontal stud at the base of the wall, which provides access for the cold lead to the inside of the wall, shall be covered by a steel plate to protect the cold lead from any possible future damages from nails or screws. • The temperature sensors need to be threaded either inside the same conduit as the cold lead, or in a separate conduit.
