Trailer hookups - historic

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glenn robinson

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I know that the four-wire mobile home feeder was first specified in 1984 (550.24). Does anyone know when the four-wire ANSI plug and socket (or just a four wire power cord) was first specified for trailers (550.5)?
 
Oldest Code I have here is 1990. 4 wire (isolated neutral) was required then, if that helps.
 
trailer hookups - historic

trailer hookups - historic

I have searched back as far as 1977 and its still there. I wonder if it goes back to post-war (WWII for you young'uns) housing boom?
 
Art. 550 for Mobile Homes was first introduced in it's entirerty in the 1965. 4-wire cords were required under 550.3(a).

Prior to that, the standard was NFPA Standard 501B.
 
480sparky said:
Art. 550 for Mobile Homes was first introduced in it's entirerty in the 1965. 4-wire cords were required under 550.3(a).

Prior to that, the standard was NFPA Standard 501B.
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I need to install a 2 pole, 3 wire, solar powered, clothes dryer at a mobile home. What article is that?
 
zog said:
I need to install a 2 pole, 3 wire, solar powered, clothes dryer at a mobile home. What article is that?
Click to expand...

Not sure of the number, but that one is older than the crust on my underwear.

Picture012.jpg
 
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