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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...

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...

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...

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...

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. ...

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...

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. ...

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...

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...

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. ...

24" of #2 alum is ~0.5 milliohms of resistance. If you turn on enough appliances in your house to pull 50 A then the voltage drop across the wire + connectors should be less than about 25 millivolts...

So from connector to connector you need to add (29 + 24) - (13 + 18) = 22" of #2 aluminum?

Can I get your pump hp and your nearest city? I'm doing a survey.

For Philly the "monsoon" is 3.1" of rain in an hour and it happens every 100 years, so more frequent events would be less than...

Buy a standalone water level switch that can handle a motor load of whatever hp your pump is and mount it within this 4" interval. It replaces the level switch in your pump or you could have a level...

After prepping the contact points with fine sandpaper I use ohmmeters because of zero shock risk, but they do have their limitations.