Some times a wattage is not listed, but an amp value is listed. You can obtain the wattage value by multiplying the amps X volts. Light duty interior extension cords tend to be made of 16 gauge wire. The wire is normally rated at 8 to 12 amps depending on the insulation used. Even at 8 Amps you are looking at 880 Watts. Thats more than most proportional T-stats can handle. A couple exceptions would be the Herpstat Pro, Herpstat II, and a Helix with power expansion modules. Now if you have some lamps plugged in as well this could be where the issue is coming from.Originally Posted by TripleMoonsExotic
Most house hold circuits today are only rated at 15 Amps (it cost less money since they only run 14 gauge romex) unless you install or have an electrician install a special heavy duty circuit in which case most of those are 20 Amps with a few exceptions being 25 to 30 Amps. (12 gauge romex is rated at 20 Amps and 10 gauge or 8 gauge can be used under special circumstances as well.) From my experience if you get above a 30 Amp need in a house you get into two phase 220 VAC circuits like what would be used on an electric cloths dryer, central air conditioner, electric stove, and complete house electric furnaces.
Since Flexwatt is wired in parallel all sections in the circuit will see the same voltage and as long as you use the same kind of flex watt for each strip in a rack (i.e. 4", 3",...) the resistance should be the same as well. This means that each strip will draw the same amount of current (Amps). In the end each strip will draw the same amount of Watts as long as all parallel connections are properly made. If the supply coming in drops to 50 volts all pieces of flex watt will see the same voltage, draw the same current, and use the same number of watts to create the same number of BTU's of heat. With all this known an extension cord powering a single channel proportional thermostat can not affect the balance of heat each piece of flexwatt delivers, unless the pieces of flexwatt are different sizes. This is all basic electronics using Ohms Law and Watts Law.
With all this said I highly recommend you re-examine all the electrical connections between the proportional T-stat and each individual piece of flex watt. On a side note as connections heat up and cool down their resistances can change. Things could very well be balanced now due to a temperature change at one of the connection locations. If the temperature of this location changes again due to a draft or something you could see (Hopefully you see it before something bad happens!) the imbalance come back.
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