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Old 08-23-2015, 08:06 AM   #21
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I always thought Reverse Polarity is when the Black Hot Wire(in this case 120 volts ) is reversed with the White Neutral Wire.. I believe an overloaded neutral is a separate issue.

What Happens When Polarity is Reversed at a Receptacle?

Most electrical appliances and devices are designed so that their "on-off" switch interrupts electrical power at the point of entry into the appliance or device circuitry or components. If you switch the hot and neutral wires that may not quite be the case, and parts of the device will remain energized or potentially energized even when the electrical device switch is OFF. No electrical current may flow, but it could flow if someone touches the wrong part of the device, or damage may be caused in other circumstances as well, as we describe next.

Found this explanation online:


Watch out: Reversed polarity on an electrical outlet is dangerous. If you accidentally reverse these wires the device you plug in to the receptacle may "work" but it is unsafe and risks a short circuit, shock, or fire.

Joe
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Old 08-23-2015, 08:10 AM   #22
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Old 08-23-2015, 08:34 AM   #23
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Originally Posted by Myrle View Post
Not good for LED lights and some electronic devices.
Do you have a source for this? Most LED lights in a RV are 12 volt.I do not know of a single TV, cell phone or computer power supply. that could care about reverse polarity.

The only thing reverse polarity can cause is hot skin if the RV has a bad ground and the ground and neutral are boned at the RV service entrance that is Illegal, against code and RVIA quality sticker as inspected annually.
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Old 08-23-2015, 08:43 AM   #24
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Watch out: Reversed polarity on an electrical outlet is dangerous. If you accidentally reverse these wires the device you plug in to the receptacle may "work" but it is unsafe and risks a short circuit, shock, or fire.
Polarity is one of many protection layers. Reverse polarity is dangerous like parking a car only with a transmission in park. As if that tiny pin will always hold a car. (A lady in the next town was killed because she did that.) Informed drivers also use the parking brake.

Polarity is an equivalent of a parking brake. Other circuits should also make reverse polarity irrelevant. But failures happen. Failures rarely happen. But that is never an excuse to ignore a defect. Engineers put polarity in for good reason.
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Old 08-23-2015, 09:00 AM   #25
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Polarity is one of many protection layers. Reverse polarity is dangerous like parking a car only with a transmission in park. As if that tiny pin will always hold a car. (A lady in the next town was killed because she did that.) Informed drivers also use the parking brake.

Polarity is an equivalent of a parking brake. Other circuits should also make reverse polarity irrelevant. But failures happen. Failures rarely happen. But that is never an excuse to ignore a defect. Engineers put polarity in for good reason.
Not sure what you mean when you say"Other Circuits should also make reverse polarity irrelevant".. If the power at the pedestal is reversed won't that affect all 120 volt ckts. in the camper??

Joe
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Old 08-23-2015, 09:22 AM   #26
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Read posts #10 & #21!!!!!! It is very simply & correctly explained.
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Old 08-23-2015, 09:24 AM   #27
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Originally Posted by meganjoe View Post
If the power at the pedestal is reversed won't that affect all 120 volt ckts. in the camper??
Voltage on a black wire is positive when voltage on the white wire is negative. Then voltage on a black wire is negative when voltage on the white wire is positive. This happens 60 times every second. If wires are reversed, then what in those two sentences changes? Nothing. Polarity is irrelevant to how an appliance operates. Again, polarity is simply another protection layer for human safety.

Be wary of most who make recommendations (ie polarity causes appliance damage) when reasons why are never provided. Junk science would almost disappear if we held others to that standard. And also demand numbers. Most of us never demand that standard making scams so easy to promote.

"Other circuits" define many concepts including galvanic isolation. Even internal filters are designed so that polarity reversal is irrelevant.
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Old 08-23-2015, 09:31 AM   #28
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Well meganjoe & Brewhedd, what more can we say?
I'm done.
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Old 08-23-2015, 09:47 AM   #29
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Originally Posted by westom View Post
Voltage on a black wire is positive when voltage on the white wire is negative. Then voltage on a black wire is negative when voltage on the white wire is positive. This happens 60 times every second. If wires are reversed, then what in those two sentences changes? Nothing. Polarity is irrelevant to how an appliance operates. Again, polarity is simply another protection layer for human safety.

Be wary of most who make recommendations (ie polarity causes appliance damage) when reasons why are never provided. Junk science would almost disappear if we held others to that standard. And also demand numbers. Most of us never demand that standard making scams so easy to promote.

"Other circuits" define many concepts including galvanic isolation. Even internal filters are designed so that polarity reversal is irrelevant.

So why are plugs designed to only be plugged in to a receptacle one way??

Joe
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Old 08-23-2015, 09:51 AM   #30
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So why are plugs designed to only be plugged in to a receptacle one way??
That was answered repeatedly - for human safety. One of many human protection layers.
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