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Electrical question - wire gauge, amps, and heat?
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randytsuch
Senior Member


Joined: 11 Jun 2009
Posts: 578
Location: LA, Ca
Expertise: I like coffee

Espresso: Expobar Office with...
Grinder: Baratza Vario
Roaster: Customized Alpenrost,...
Posted Tue Dec 28, 2010, 9:54am
Subject: Re: Electrical question - wire gauge, amps, and heat?
 

FWIW, I have a boost transformer, but it is before the dimmer in my fan circuit.
The dimmer is intended for a ceiling fan.
I have used this a couple times a week, for over a year, with no problems.

And I also have a fuse.  I also normally use a GFI outlet where I roast at, better safe then ...

My schematic is here
Click Here (4.bp.blogspot.com)

Randy
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dana_leighton
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dana_leighton
Joined: 11 Jan 2002
Posts: 2,035
Location: Fayetteville, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Tue Dec 28, 2010, 11:20pm
Subject: Re: Electrical question - wire gauge, amps, and heat?
 

Thanks for everything folks. In investigating further I find that one of the quick connect terminals on the fuse holder was nonstandard: much too thin for the female quick connect terminals. It was really designed for soldering. That looseness would likely have contributed to the resistance increase and heat. I have ordered a replacement from Mouser. I am also replacing the wiring from power to fuse to power switch with 12 gauge wire just in case.

While I was ordering from Mouser, I also ordered a small DC fan to install in the housing to try moving some cooler air around in the case. It will be powered by a wall wart. I don't want to suck a lot of dust and debris in to the case, so I may have to investigate filters too...

I also am looking into moving the fan speed control to after the transformer.

Thanks for all the suggestions and advice!

Dana.

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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