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I have been called back from the grave to respond to a private message on the subject above. Do not send me any more private messages or I will do my best to pursue a legal action against you for harassment. While it is not 0.0000, the likelihood of a light bulb used for test purposes...

I would not have expected some of these values. http://www.infrared-thermography.com/material-1.htm

Maybe you could put heat tape on the duct but I don't know that anyone does this. For troubleshooting purposes only, you might temporarily put a small lamp, 10 W or so @ 12 V, in the duct or fan housing. At least it will give you some idea of how many BTU/hr you need to stop this problem.

Thanks for your help. Soon I should be able to post a sizing guide that works to some level of accuracy.

Each insulated wire goes to neutral, hot, a switch or the lamp. The colors will help some but with an incand. bulb, wire labels, an extension cord, clip leads and a DVM you can figure this out. But it's tedious.

Is this a description of you? http://en.wikipedia.org/wiki/Sadistic_personality_disorder

100x20/17.8= 112 % so the tolerance on the hot resistance value for elements is maybe (112 - 100)/2 = +/- 6 %, assuming this small sample size of 4 is representative of all 4500 W elements. Probably the actual tolerance is quite a bit wider than 6 %. Close enough for guvmint wuk! And the...

I just used the same size that was in there before. If the house has gas appliances put in 3 CO detectors. This will give you 99.9999 % reliability, so called six-nines, aircraft level, safety. Get the sensitive kind. "1. Location of the Exhaust Fan and Air Changes Per Hour: Where you...

http://en.wikipedia.org/wiki/Arc_flash Supercolliders take as much power as a town. In 2008 this one http://en.wikipedia.org/wiki/Large_Hadron_Collider shorted out, melting a half ton of copper extremely quickly. Too bad they didn't get it on video! I doubt anyone was hurt; they probably...

Your mechanical force caused the grounded metal strip that now has a hole in it to move a fraction of an inch and touch a bare hot wire in the box, and for a few milliseconds more than 400 A flowed. You need to find and insulate that wire, perhaps with approved heat shrink tubing. If there...

To paraphrase Jack Nicholson in Terms of Endearment, buy her something that will "kill the bug up her @$$".

OK so far. What is she saying?

IIRC correctly it took me 3 hours to remove the old and install the new, from Grainger.

http://www.youtube.com/watch?v=Tt-uMBPQS7g

"Moments after being released on bail, WikiLeaks founder Julian Assange was already making plans for his next venture, a social network for diplomats called Twofacebook. Mr. Assange said he came up with the idea for the new site while combing through hundreds of thousands of pages of WikiLeaks...

So there was current flow in the pipes to ground. 10' of half-inch ID copper pipe has a resistance of . . .I forgot. When this wine wears off I can probably tell you. :) Or not. :(

You can use your elec. meter and a clock as an ammeter. The formula is about 1/3 of the way into this link. http://en.wikipedia.org/wiki/Electricity_meter An oven, elec. dryer or water heater may each take 20 A or so. Elec. heat by itself might pull 100 A. But whatever current you draw the...

Then your float switch is set too low?

Yes, post diagrams of the original timer chart...

If you ask, the manufacturer will supply you with dimensioned drawings...