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Old 08-09-2010, 08:56 PM   #519
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Please say you isolated the bright zinc-plated steel receptacle box from the aluminum!
No I didn't, but I can......why?
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Old 08-09-2010, 08:59 PM   #520
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I'm curious, too. Would the same thing apply to the circuit breaker panel inside the camper? I don't recall it being isolated from the aluminum wall either.

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Old 08-09-2010, 10:34 PM   #521
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Zinc to aluminum contact equals a battery, even though the bright zinc coating on that box is very thin it's bad mojo. Once the corrosion starts then the iron chimes in on high humidity days and its belly pan to outrigger magic crystals.

On my 73 its been so long since I gutted it I don't remember where it was hung - but its a painted steel box, not galvanized, and if it were on the liners they were vinyl coated...
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Old 08-10-2010, 07:12 AM   #522
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Originally Posted by Jim & Susan View Post
I'm curious, too. Would the same thing apply to the circuit breaker panel inside the camper? I don't recall it being isolated from the aluminum wall either.

Jim
Mine wasn't, and there was some small evidence of corrosion, likely from humidity over the years. I repainted my box and reinstalled with neoprene washers separating steel from aluminum, but really I wouldn't have had to, 45 years and the damage was minimal.
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Old 08-10-2010, 09:21 AM   #523
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Mine wasn't, and there was some small evidence of corrosion, likely from humidity over the years. I repainted my box and reinstalled with neoprene washers separating steel from aluminum, but really I wouldn't have had to, 45 years and the damage was minimal.
My electrical box wasn't painted, but the Zolatone had been sprayed before the box was mounted so it was effectively isolated from the aluminum.

Direct steel to aluminum contact can produce some impressive corrosion. The PO of my trailer mounted a steel bracket to the outside of the trailer. Granted, that was exposed directly to the rain, but when I took it off, I found it had eaten a dime dized hole clear through the skin and had an area of deep corrosion the size of a softball with much of that area reduced to very thin aluminum. I had to patch the entire area.

Toastie - I'd recommend isolating that box from the skin. Electrical tape or even duct tape to the back of it would probably do a lot to reduce the potential for corrosion.

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Old 08-10-2010, 11:19 AM   #524
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my rule of thumb: NO STEEL TOUCHES ALUMINUM.
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Old 08-11-2010, 08:41 PM   #525
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This is my very detailed shower plan...........toastie
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Old 08-12-2010, 07:35 AM   #526
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I was thinking about the junction box corrosion issue...Could you use a plastic junction box? I would think that should eliminate any possibility of corrosion. Just thinking outloud.
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Old 08-12-2010, 08:07 AM   #527
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Plastic box... I'd hesitate on that since the condition of the external plug and socket at some point in the future could lead to a bad connection and high-temperatures, but a gasket between the two metals, even painting the box, would have a good return on the effort.
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Old 08-12-2010, 10:36 PM   #528
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Household plastic boxes are flame retardant and required to handle temps above where the insulation burns. Personally, in a vibrating environment where wires can come loose, I'd have a tough time deciding if I wanted an insulated box, or a metal one that will probably trip a breaker if contacted, but might not.

What does code say?
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Old 08-14-2010, 09:52 AM   #529
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Installed my fresh water fill today, and decided to go stealth. Didn't what to cut another exterior hole plus my fresh water supply will be behind a locked door.

toastie
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Old 08-14-2010, 11:54 AM   #530
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Very nice! Bonus - you can see exactly how full the tank is getting!
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Old 08-14-2010, 08:28 PM   #531
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Started to permanently install the AC today. The new drilled hole to AC is directly over a larger hole going thru the belly pan. The drip pan in line with aluminum and I used plenty trempro 635.
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Old 08-15-2010, 02:02 PM   #532
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Finished the install on the AC today.........toastie
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