Alternatively, since you do not need the neutral for your 240V device, you can cap it off entirely in the box. If you have a white neutral wire, connect it so that wires coming in and out continue onward, bypassing the device. If the thermostat's electrical box is metal, it also must be grounded, with a pigtail wire or with a grounded conduit path. Stelpro Thermostat STE252NP+ Operation & user’s manual (18 pages) 25. Stelpro Thermostat STE302P Operation & user’s manual (14 pages) Stelpro Thermostat STE302P Operation & user’s manual (20 pages) 24. That third ground will attach to the device (or you will use the wire already on the device). Stelpro Thermostat STZW402+ Operation & user’s manual (16 pages) 23. Wire-nut the two ground wires, adding a third ground wire. They are also equipped with an over-current protection circuit to ensure their safety. If you have a grounded thermostat: Does your thermostat have a green ground screw on it? Or similarly, does it have a green or bare wire coming out of it? If so, this is the wire that connects your device to the ground, and this is crucial for safety. Stelpro > Heating cable systems > Thermostats Thermostats Our floor heating temperature controls are cleverly designed to read the floor or ambient air temperature. You will wire-nut the ground wire coming in with the ground wire leaving the box, bypassing the device entirely. If there is no ground for the thermostat: Devices such as a Cadet Mechanical Thermostat are plastic, and thus, do not require grounding. There are two ways to approach the attachment of the ground wire to the thermostat:
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