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Old 04-25-2019, 10:46 AM   #16
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Re: Are twist connectors safe to use for light fixture wiring?


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Originally Posted by huesmann View Post
Even in an accessible panel?

Obviously not, or nothing could ever get done. But if you're indirectly suggesting that installing a panel of some sort here could solve the problem, that would be worth considering, if such a thing could be tolerated aesthetically.

Last edited by jeffnc; 04-25-2019 at 10:50 AM.
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Old 04-25-2019, 10:59 AM   #17
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Re: Are twist connectors safe to use for light fixture wiring?


Moved switches? I don't think so. There's at least 8 cable runs there, and I can't imagine how any group of switches could possibly have had 16 cables running in and out of it. These look more like an entire group of homerun circuits, likely to a panel located below. Then someone just had to have "open concept" floor plan and discovered that wall cavities often conceal things like electrical circuits.
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Old 04-25-2019, 11:24 AM   #18
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Re: Are twist connectors safe to use for light fixture wiring?


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But, without condoning or encouraging this kind of thing, if the joints are staggered, well connected with wire nuts, secured and protected by good-quality tape, and protected from being pulled or punctured, what's the failure mode?
Ever see a wire nut connection fail ?

If a wire nut overheats/melts and the connection is right up against the wood, you are liable to have have a fire. That is one of the reasons why the wire nut splice must be in a box.

The tape really isnít any protection, it will just melt away. (Taping wire nuts usually means you are not confident about the way you installed the wire nut). From what I can see in the pic, the tape job is amateurish.

I am not worried about the staples. They appear to be NM staples made for the job (no sharp edges). None of the staples appear to be over driven (too tight), or too loose.

The stapling appears more professional than the splicing. (Most likely they are original installation)
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Old 04-25-2019, 01:34 PM   #19
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Re: Are twist connectors safe to use for light fixture wiring?


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Originally Posted by jeffnc View Post
Obviously not, or nothing could ever get done. But if you're indirectly suggesting that installing a panel of some sort here could solve the problem, that would be worth considering, if such a thing could be tolerated aesthetically.

One would also have to consider the size of the box or boxes. As well as protection on three sides for the cables.
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Old 04-25-2019, 02:52 PM   #20
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Re: Are twist connectors safe to use for light fixture wiring?


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Originally Posted by CaptTom View Post
...if the joints are staggered, well connected with wire nuts, secured and protected by good-quality tape, and protected from being pulled or punctured, what's the failure mode?

Don't beat me up; it's just a thought experiment. Could it fail in such a way as to be any more dangerous than the code-approved alternative? I'm drawing a blank.
Fire. If you do any significant amount of electrical work, you've come across some burned wire nuts. That's how they tend to fail: a high resistance connection which heats up under load. Electrical code requires boxes primarily for fire prevention. UL listed junction boxes are tested to contain overheating connections and devices while limiting the risk of fire spreading out of the box.
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Old 04-25-2019, 10:07 PM   #21
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@CaptTom , the issue with a buried splice is that you do not know where to look should something fail.
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Old 04-26-2019, 07:51 AM   #22
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Re: Are twist connectors safe to use for light fixture wiring?


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Originally Posted by mpoulton View Post
Fire. If you do any significant amount of electrical work, you've come across some burned wire nuts. That's how they tend to fail: a high resistance connection which heats up under load. Electrical code requires boxes primarily for fire prevention. UL listed junction boxes are tested to contain overheating connections and devices while limiting the risk of fire spreading out of the box.
Are things like Wago connectors better than wire nuts in these situations?
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Old 04-26-2019, 09:44 AM   #23
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Re: Are twist connectors safe to use for light fixture wiring?


No.... See MPOULTON #4 and KTOWN #12.
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Old 04-26-2019, 12:15 PM   #24
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Re: Are twist connectors safe to use for light fixture wiring?


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Originally Posted by huesmann View Post
Are things like Wago connectors better than wire nuts in these situations?
Which situation are you referring to?

Without an approved, accessable box, it would seem the only approved splice is the one shown by mpoultan and ktownskier.

With a box, whether you use wago or wire nuts would be a choice of personal preference and cost.
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Old 04-27-2019, 07:36 AM   #25
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Re: Are twist connectors safe to use for light fixture wiring?


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Which situation are you referring to?
Um, the situation where you are connecting two wires together?
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Old 04-27-2019, 08:25 AM   #26
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Re: Are twist connectors safe to use for light fixture wiring?


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Originally Posted by ktownskier View Post
Here is the item that @mpoulton speaks of:




Dan
Does the NEC allow these to be buried ? If so are there any conditions ?

They are not available in Canada and not approved.
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Old 04-27-2019, 02:09 PM   #27
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Re: Are twist connectors safe to use for light fixture wiring?


The original use of those connectors were as quick interconnectors for mobile/modular homes that were transported as separate sections. If dealing with them, you suspect that they are located where the sections join.

There is no reason to suspect them in a house framed on site.

Since the typical homeowner canít remember where all the GFCIs are located, they most likely are not going to remember where any of the Tyco splices are buried. Nor will any subsequent owner have any idea that they exist.

IMO, they should never be buried behind drywall, even if permitted by code. Put the splices in a readily accessible box so you know that there should be a continuous wire(s) between the two points.
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Old 04-27-2019, 09:24 PM   #28
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Re: Are twist connectors safe to use for light fixture wiring?


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Does the NEC allow these to be buried ? If so are there any conditions ?

They are not available in Canada and not approved.
They are NRTL listed and NEC approved for completely concealed installation (i.e. behind drywall with no access). That is the intended purpose.
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Old 04-27-2019, 09:26 PM   #29
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Re: Are twist connectors safe to use for light fixture wiring?


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IMO, they should never be buried behind drywall, even if permitted by code.
That's certainly a valid personal decision, but they are tested and approved specifically for this purpose and it is entirely legal to use them that way, as intended.
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Old 05-01-2019, 02:46 PM   #30
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Re: Are twist connectors safe to use for light fixture wiring?


Just to be clear, if splices with wire nuts are in an accessible junction box it would pass code? Does the junction box need to be compliant in any special way, fire rated? Are the blue boxes- single, double, triple gang, etc. available at HD, Lowes compliant as junction boxes?
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