polarity tester

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muskoka guy

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Oct 15, 2012
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MUSKOKA ONTARIO
I have read that testing the power for proper polarity is a good idea in case someone has wired the pedestal at a campground incorrectly. I was going to buy one the other day but it was just a standard 120 volt plug in type that looks like the end of a normal extention cord. I got thinking, how is this going to test an outlet for a 30 amp rv plug. Do you have to buy on that looks like my 30 amp 3 prong rv plug. Thanks in advance.
 
Just buy a normal digital voltmeter. It should be in your toolbox anyway. You can get one at the auto department of Walmart for under $20 or order one from Amazon.
 
I have several of those. I guess if I know which leg is the neutral, I can check against the ground to make sure it is in the right position on the outlet.
 
muskoka guy said:
I have several of those. I guess if I know which leg is the neutral, I can check against the ground to make sure it is in the right position on the outlet.
Correct. The neutral always has the bigger slot.
 
You could also use a tester like you were looking at along with a 30 amp to 15/20 amp adapter (which probably carry anyway).
 
The easy way is to buy an adapter or make up one of these, i.e. http://www.myrv.us/electric/Pg/tester_30amp.htm
A great resource for RV electrical basics the parent web site www.myrv.us/electric/Pg/tester_30amp.htm 

"Do not trust any installation done by anyone including yourself or a professional"

I gotta tell ya I have let out my share of magic smoke and it is real difficult to put it back 
 
Shadow Catcher said:
"Do not trust any installation done by anyone including yourself or a professional"

There are two reasons why, when people talk about installing an RV outlet at home, i recommend they go with a 50 amp.

1: The cost of upgrading from 30 to 50 is higher than the added cost of putting in a 50 to start with, way higher.

2: I have read far too many stories "I had an electrician install an outlet for my 30 amp RV and when I plugged in all the magic smoke came out"

(ok, I seriously rephrased the last part)

Turns out Mr. Professional failed to read the 125 volt label on the TT30 and looked at it said "Dryer/Air Compressor" and wired it for 240 volt.

Now,  I .. personally.. did not make that mistake.
 

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