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    handy goth's Avatar
    handy goth Posts: 2, Reputation: 1
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    #1

    Oct 1, 2009, 09:19 AM
    Programmable thermostate wiring
    Greetings.
    I'm installing a Thermosoft radiant heating system in the living room floor of our 160 year old house, over new joists and subflooring and under laminate flooring. I have two questions -

    1. Lines from thermostat to floor pads - instructions say they should be routed through metal conduit (no problem there, I have access to the back of the wall where the thermostat will be installed). Is that just to protect the lines, or is it to shield the surrounding environment from heat build up? I intend to install the conduit, just curious.

    2. In-feed line - the thermostat has no place to attach the ground. Is it safe to attach the ground to the box? (The thermostat is an OJ UCCG-9991 programmable, made in Denmark, I believe). Getting help from Thermosoft is almost impossible.

    Just want to make sure all is well before it's inspected.
    Thanks!
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Oct 1, 2009, 10:32 AM
    1. Lines from thermostat to floor pads - instructions say they should be routed through metal conduit (no problem there, I have access to the back of the wall where the thermostat will be installed). Is that just to protect the lines, or is it to shield the surrounding environment from heat build up?
    Typical thermostat leads are low voltage and low current. There would be almost no heat build up. This is for protection of the thermostat cable. If this is a high current/high voltage situation (where you're actually switching large amounts of power), it might possibly be for heat protection, but in my mind, that's doubtful.
    handy goth's Avatar
    handy goth Posts: 2, Reputation: 1
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    #3

    Oct 1, 2009, 11:15 AM

    The leads to the heating mats under the flooring are 14 gauge, labeled as 120V and when I check the resistance, it's averaging around 60 ohms. In my mind, I think they might get pretty warm. (I'm a woodworker, not an electrician! This stuff mystifies me sometimes).
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