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Old 07-10-2013, 10:33 AM   #71
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Is there a plug-in polarity tester for the 220v rv outlet that would show a floating neutral? I do not remember ever seeing one,
That RV electric link describes a way to apply a load and test - but i would need to read through it again
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Old 07-10-2013, 10:43 AM   #72
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Most people use a device similar to this to test 120v.
I Googled but could not find a plug in device to test 240. It would be nice to have something that is plug and play, since many people do not have a multi-meter, nor understand the functions.
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Old 07-10-2013, 10:49 AM   #73
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The RV electric link shows how to test both 120 legs on the 50 amp service - both voltage and polarity with the device you show there
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Old 07-10-2013, 10:50 AM   #74
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It isn't plug n play though - it ha a bit of rigging to make the device - then it was plug n play
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Old 07-10-2013, 10:51 AM   #75
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But did require a bit of rigging the setup though and then it is plug n play
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Old 07-10-2013, 11:26 AM   #76
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Quote:
Originally Posted by A W Warn View Post
Information in this link cannot answer my question. My question is specifically about Airstream system, not RV generality.
The question you asked is the same whether it is an airstream or SOB. Electric basics are electric basics.
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Old 07-10-2013, 04:26 PM   #77
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Originally Posted by A W Warn View Post
Most people use a device similar to this to test 120v.
I Googled but could not find a plug in device to test 240. It would be nice to have something that is plug and play, since many people do not have a multi-meter, nor understand the functions.
I was hoping you could just buy something that does the same thing...but this is I suppose an option...

50-amp Tester

Anyone know of a different product...you have to buy the components for this one and make it - not difficult...and only for testing..so I GUESS it would be hard to screw something up
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Old 07-10-2013, 04:47 PM   #78
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No, you could connect it wrong and then it would not tell you about a problem or tell you there is a problem when you do not have one. I wouldn't build this if you do not know what you are doing and you do not understand why it is connected the way it is. I honestly do not know whether there is a commercially available simple tester for 50 amp out there, but I do know there are expensive surge suppressors, voltage regulators that check the connections when you plug the device in. If you are worried and if you do not know what you are doing, and if you have a 50 amp trailer, then maybe your best bet is to go the expensive route...if you want the insurance.
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Old 07-10-2013, 07:39 PM   #79
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i will def!! buy the surge protection
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Old 07-10-2013, 08:13 PM   #80
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Learn to use a digital volt meter (DVM) and also learn what each pin does. On the 50A socket there are two hots a neutral and a ground. There should be 0 V between the ground and neutral. There should be 220V between the two hots and there should be 120V between either hot and the ground and neutral. A volt or two is nothing to worry about. If you are running a 50A trailer make sure you know how the power is being distributed. Things like not running the microwave and the AC at the same time. Not running 2 AC units at all.

The DVM is the Swiss army knife of electrical tools. You can also get one that measures current so you can measure how many amps you are using. You can use it for AC or DC and also resistance so you can check for shorts and open circuits etc. A DVM should be a part of your tool kit.

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Old 07-10-2013, 08:19 PM   #81
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Perry, why do you think that 50amp service cannot supply two running AC units? if a single 30amp 120v can run one, it stands to reason that two 50amp 120v legs can run those two...and perhaps a bit more as well...?

I suppose load testing with various appliances will help.

Oh and I will use the quality surge protector mentioned ("TRC surge guard") which shuts things down if voltage is too high or too low..
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Old 07-10-2013, 08:26 PM   #82
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and that is a good point perry...I did see in various links in this thread descriptions and youtube video about how to use a multimeter and test 30 and 50amp voltage as you described....gives me a bit more confidence
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Old 07-10-2013, 08:35 PM   #83
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Quote:
Originally Posted by perryg114 View Post
Learn to use a digital volt meter (DVM) and also learn what each pin does. On the 50A socket there are two hots a neutral and a ground. There should be 0 V between the ground and neutral. There should be 220V between the two hots and there should be 120V between either hot and the ground and neutral. A volt or two is nothing to worry about. If you are running a 50A trailer make sure you know how the power is being distributed. Things like not running the microwave and the AC at the same time. Not running 2 AC units at all.

The DVM is the Swiss army knife of electrical tools. You can also get one that measures current so you can measure how many amps you are using. You can use it for AC or DC and also resistance so you can check for shorts and open circuits etc. A DVM should be a part of your tool kit.

Perry
Quite the contrary!

When an RV uses a 50 amp service, it load balances the large drawing appliances over the 2 separate 50 amp 120VAC feeds. There is absolutely no danger running 2 roof A/C units together at the same time. Large motor homes do it all the time. Airstreams with 50 amp service, connected to a 50 amp power pole will provide sufficient AC amperage (wattage) to power both roof A/C units at the same time. You can even run the microwave at the same time, provided that your total amperage is below the individual 50 amp leg's capacity.

If you have only 220 VAC between the 2 hot legs, you are almost 10% below the standard voltage, which is 240VAC, or 120VAC per leg. 108VAC, or 216 VAC for the 2 legs is reaching the lower threshold for proper operation of AC appliances.
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Old 07-10-2013, 09:00 PM   #84
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ive heard 100 and now 108....if <108, this is a problem then? What happens in such a case? Or what can happen (i presume higher loads more likely to flare up the issue?).

The TRC safeguard will protect from lower voltages as well correct? At what point does the TRC unit trip? 108? 100?
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