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Old 10-23-2014, 09:37 AM   #11
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In the case of the TV example, most (probably all) TVs sold in the US have gone through UL testing to ensure the combination of power cord size and internal fuse does not cause a fire hazard. In the case of the extension cord example, there are a lot of house fires started by faulty wiring and improper use of extension cords. I agree that the risk in this case would be small if an inspection of the wiring was done prior to making the connection, but any time you deviate from accepted standards, you should really do a risk analysis. In most cases, it is not practical to do a complete risk analysis and you are better off just following the standards.
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Old 10-23-2014, 09:56 AM   #12
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Do a risk analysis? We're campers! Sounds like anal government bureaucratic double-speak.
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Old 10-23-2014, 10:33 AM   #13
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I can't think of any situation where a fault in the cord or connector (or anywhere before the 30 amp trailer breaker) would cause more than 30 amps, but less than 50 amps to flow. Most faults will be a direct short, which will cause far more than 50 amps to flow. Under a direct short, there will be little difference between the time a 30 amp or 50 amp breaker opens.

The #10 power cord will carry enough current to open a 50 amp breaker without damage.
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Old 10-23-2014, 11:13 AM   #14
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What Jon said.
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Old 10-23-2014, 11:13 AM   #15
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Quote:
Originally Posted by Vermilye View Post
The #10 power cord will carry enough current to open a 50 amp breaker without damage.
Interesting thought. I made up a #14 power cord for plugging in to a 20 amp outlet when I don't need to run the air conditioner, rather than drag out the 30 amp cable. So if I run my light duty power cord, made with #14 wire, to a 20 amp plug into a couple of adapters to connect to a 50 amp service, my power cord may be the fuse in the circuit. I don't know why I would want to do that, but I can picture a pretty spectacular result!
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Old 10-23-2014, 11:41 AM   #16
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I completely respect everyone's opinion here. I have read through many posts from Jon and others on the forum, and have learned quite a bit. I have one additional question to throw out there. If the 50A breaker can provide adequate protection for a 30A trailer, why do campgrounds have a separate 30A breaker instead of just tying the 30A receptacle to the 50A breaker to reduce costs.
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Old 10-23-2014, 12:06 PM   #17
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If you have the Progressive Industries EMS protection installed by ETI you will not need to worry about the "What if" happenings.
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Old 10-23-2014, 12:33 PM   #18
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Quote:
Originally Posted by NJ Joe View Post
If the 50A breaker can provide adequate protection for a 30A trailer, why do campgrounds have a separate 30A breaker instead of just tying the 30A receptacle to the 50A breaker to reduce costs.
So your trailer can be connected, as the cord end won't fit into a 50A receptacle.

In the case of a fault, there is no doubt that #10 wire would trip a 50A breaker. The only potential issue is if you somehow overloaded the circuit with appliances drawing too much current. This could potentially cause the #10 cable to act as a fuse if it were protected at 50A. However, the 30A breaker in the trailer would protect you in this case, tripping if the draw became excessive. This would leave the cable to the pedestal as the only improperly protected section in the circuit, and the only thing that could happen to it is a fault from being cut, in which case the breaker would still trip as Jon explained.

Bottom line. There really is no need to be concerned.
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Old 10-23-2014, 01:25 PM   #19
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I made one of these as a way to use a light cord when plugging into a 15/20 amp receptacle. It also gives me a practical way to carry a spare Marinco twist lock connector since that can be difficult to replace on the road.
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Old 10-23-2014, 01:49 PM   #20
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Quote:
Originally Posted by Vermilye View Post
I made one of these as a way to use a light cord when plugging into a 15/20 amp receptacle. It also gives me a practical way to carry a spare Marinco twist lock connector since that can be difficult to replace on the road.
Smart thinking Jon.
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