Usage Costs For In Floor Heat Wire ?

Electrical novice here.... I think calling myself even a novice is too much credit.

The good thing is I'm not the one that did the work....



My question is about votls/amps/wats correlations.



Long sorry short ... I have in floor heating wire that was installed - this is not the typical off-the-shelf type (have a friend in the home products biz and he picked this up for me on a recent trip to china).



I am trying to estimate usage costs come winter time... but something just does not sound right to me...



It is 18W/220V heat wire...



        Have 120/240 Volt Main Service



Is the calculation correct:



Power       18w per meter and i have 220 meters (700 Ft)   

 

- total power is 220m*18w/m, if your voltage is 240V, the Amps will be 220*18/240v=16.5A.



If correct - That means this is going to be insanely expensive to run - correct?


      


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Hello All,

Hopefully I am posting this in the correct forum!

I am new to the forum and I have a question I would like to pose.

I am trying to make an extension cable for my telescope hand control.

I have had good results with the 25' length  but it is to short . So I made another one 50' in length but it give me connection error codes. The cable is correct as it worked for a while .I am using an rj12 6pin connector with cat5 cable(24awg). The power supply is 12V DC with 2.5 amps running on house AC.

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"I just returned from Mobile Mart, my go to store for anything for my TT.  Was looking for a 25ft extension for my 30 amp power cord. The salesman  filled me in on some tips about buying extension cords for service.



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QUESTION:  can I run (2) 14-2 romex wires in (1) 3/4 BX Armored cable?



SETUP: I am finishing my basement and a few main floor circuits are intermingled with the basement lights and outlets.  In finishing the basement, all basement electrical will be on its own circuit. Therefore, I need to rewire some main floor items.



For instance, the main floor living room outlets go through the den area below in the basement. The 3/4 BX cable goes through the ceiling to the outlets.



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