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#199739 03/06/11 04:22 PM
Joined: Oct 2000
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This is an old wire nut that we use to come across every now and then. We heard that it was used in places where there was heavy vibration.

Someone said that the wires were tightened under the screw to prevent the wires from coming apart. I don't know how true it is, but they look like it would work well.

Harold

[Linked Image from electrical-photos.com]

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Joined: Mar 2004
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T
twh Offline
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That a Marr connector.

Joined: May 2003
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Now they come with a Roberson screw head

Joined: Feb 2002
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H
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Doug,

Were they used where vibration was an issue? Like I said, I just heard them called "Vibration" wire nuts but no one could give me the right name. Till now.




Joined: Feb 2002
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H
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twh,

is Marr a trade name or just a style of connector?

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twh Offline
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I think it's the name of the inventor. The company that made the original Marr now makes the Marrette wire nut. By now, the name might be like kleenex is to facial tissue, but I'm not sure if anyone else makes that type of connector. When I went to school, they had specific instruction on not twisting the conductors unless one was stranded and the other solid.

Joined: Aug 2002
Posts: 402
J
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And remember to put the thread on first towards the insulation, otherwise the cap doesn't screw on far enough to cover the bare wires.

I think it's another Canadian thing.
They are still available and sold as anti vibration.

http://www.tnb-canada.com/en/catalogues/online/comresconstruction/pdf/c5/01_marrcat_e.pdf

Last edited by jdevlin; 03/07/11 12:05 PM.
Joined: Feb 2002
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H
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I was going to say that only my northern neighbors seem to know about this type of wire nut. I never saw lots of these connectors but I was out in the field from 1976 to 1998 and I think I only saw maybe 2 dozen or so.

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twh Offline
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Harold, I've never installed one and I've been around as long as you have. A couple dozen is about the same number that I've run into, too. To add to jdevlin's point, some of them were backwards.

I think a vibration wire nut is a normal wire nut tightened with pliers.

Joined: Dec 2001
Posts: 2,492
T
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Looks like someone crossed a wire nut and a European "choc block" style connector laugh

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