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Old 08-20-2016
bluefish7 bluefish7 is offline
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Default 3 wire with ground on an X Y Z with ground plug?

Tech help! I've got two replace the twistlock 3 blade female that plugs into the back of my 68, the old one was Hubbell 2647 that I'm being told is now 7764C, both have X,Y,Z and ground. How do you wire that with 3 wire (incl ground) 4 AWG cable? Jumper two of the hots as the old plug did in pic? Or just leave one of the hots empty? This is just for 30A 120v. Thanks for any help!
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Old 08-20-2016
Rick Davis Rick Davis is offline
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I am sure I misunderstood, but someone told you to use a 4 prong 50 amp female cord end for plugging into your 3 prong 30 amp bus male plug? I don't think a 7764C is what you want.
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Old 08-20-2016
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If you are plugging the bus end into a 50 amp socket and the plug end is a 30 amp, then you would jumper the two hots to give power to both sides of the panel like your old one. But be sure to understand what you are doing, don't assume anything.

What you appear to have is a home made 30 to 50 dogbone adapter. I used to have one for my FC and it was very easy to deal with when only 30 amp was available.
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Old 08-20-2016
bluefish7 bluefish7 is offline
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Thanks I think thats what I need to do, for some reason I have 50 amp plugs for both the old and new, if they'll work I'd rather not buy others. The old plug was jumpered between the hots, I just wired up the new plug with just leaving the other hot empty and the front air conditioner won't come on so I guess I'll need to jumper. Is there a specific piece that serves as a jumper or can I use a piece of 8 AWG ?
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Old 08-20-2016
jwood jwood is offline
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Quote:
Originally Posted by bluefish7 View Post
Tech help! I've got two replace the twistlock 3 blade female that plugs into the back of my 68, the old one was Hubbell 2647 that I'm being told is now 7764C, both have X,Y,Z and ground. How do you wire that with 3 wire (incl ground) 4 AWG cable? Jumper two of the hots as the old plug did in pic? Or just leave one of the hots empty? This is just for 30A 120v. Thanks for any help!
Show us a pic of the other end of this plug
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Old 08-20-2016
bluefish7 bluefish7 is offline
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All plugs and bus male are 3 prong, the two hots on the 50 amp plug (3 blade with ground on side) are what were bridged before and the new Hubbell is set up the same way really.
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Old 08-20-2016
bluefish7 bluefish7 is offline
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It is a 30 amp NEMA twistlock 3 blade, I don't have pic but looks like this I believe



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Show us a pic of the other end of this plug
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Old 08-20-2016
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Quote:
Originally Posted by bluefish7 View Post
It is a 30 amp NEMA twistlock 3 blade, I don't have pic but looks like this I believe
I'd be VERY careful here. That's a standard L5-30 plug designed for 30a at 125v. The three conductors are Ground, Common, Hot. NONE of these should be "shorted" at the plug.

Your original post said there were x,y,z AND a ground. That does NOT describe an L5-30 plug as shown here.
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Old 08-20-2016
bluefish7 bluefish7 is offline
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I think I was confused, the generator's outlet is an L5-20 that I'm getting power from at 30 amps 120v, it is a 3 prong twistlock receptacle, so the male to that is whichever matches at the end of my line. The cable has a hot, ground, and neutral connected to that male. The other end is the Hubbell 7764C (3 prong with ground contact on side) that has X Y Z and ground terminals and plugs into the bus, I'm not using Y. On the old Hubbell (2647) that went into the bus, they had X and Y jumpered and everything worked. Now that I'm not using Y, the front A/C doesn't work but the Hubbell 7764C twistlock fits in the same male bus end that the old twistlock did and that old one was marked 50A.
Here's a link to the 7764C
http://www.hubbellcatalog.com/wiring...sp?PN=HBL7764C


Quote:
Originally Posted by rtpn60 View Post
I'd be VERY careful here. That's a standard L5-30 plug designed for 30a at 125v. The three conductors are Ground, Common, Hot. NONE of these should be "shorted" at the plug.

Your original post said there were x,y,z AND a ground. That does NOT describe an L5-30 plug as shown here.
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Old 08-20-2016
jwood jwood is offline
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Quote:
Originally Posted by rtpn60 View Post
I'd be VERY careful here. That's a standard L5-30 plug designed for 30a at 125v. The three conductors are Ground, Common, Hot. NONE of these should be "shorted" at the plug.

Your original post said there were x,y,z AND a ground. That does NOT describe an L5-30 plug as shown here.
Mike is absolutely correct here. This is an old style 240 volt twist lock that grounds on the outer ring of the plug. Look at the configuration in the owners post. Someone has made this original cord to be in effect a dog bone from 30 amp 3 wire service to power both sides of panel. Not up to modern standard but I guess it was working
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