Home>Discussions>ELECTRICAL & LIGHTING>Connecting new copper wire to old aluminum wire
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Lots-o-work
Connecting new copper wire to old aluminum wire

I am tearing up an old sun room and noticed that the wiring is the old style, it looks aluminum probably 50+ years old. It looks to be in good shape but I would like to replace what I can. I believe that I will be able to trace it to a junction point where I can replace the wiring from the junction to the outlets. Once I do the remodel in the other room I will then try to replace that wire all the way back to the breaker. My question is can I attach new copper wire with the old stuff? Since the wall is open now it is the best time to change out the section of wiring I am just not sure if this would cause any issues. I appreciate any help you can provide.

canuk
Re: Connecting new copper wire to old aluminum wire

There are special connectors that need to be used for copper to aluminium .
You will need to have an electrical permit and inspection done especially when it comes to aluminium wiring ---- insurance companies are very particular about this.

To be honest if you can run new copper from the panel that would be best.
Besides --- I wonder if this room shouldn't be on it's own circuit to begin with.

JLMCDANIEL
Re: Connecting new copper wire to old aluminum wire

I agree with Canuk. At this point there are only two types of connectors that are approved for AL to CU connections. One is a crimp connector that requires a special crimping tool (about $200) the other is the Alumiconn connectors
Jack

Ernie_Fergler
Re: Connecting new copper wire to old aluminum wire

Is the wire in question aluminum?
Depending on the type of wire used during the original instillation, it might just have been coated with Tin{?} over copper.
Just a thought.....:cool:
If it is indeed aluminum, follow the advise posted above and you will not go wrong.....

Lots-o-work
Re: Connecting new copper wire to old aluminum wire

Interesting, it looks like the wire is copper with some sort of plating. So now what? Do I treat this as traditional copper wire and just tap into it?

It seems like my options are to either change out the wiring at the point it enters the sun porch or tap into another circuit where the wiring has already been updated, then cap off the old wiring inside the wall, then leave a access point. The problem with this is that there may already be too many circuits on the new wiring’s breaker. So you know I will be replacing 3 or 4 plugs.

Lots-o-work
Re: Connecting new copper wire to old aluminum wire

Hence the post

Ernie_Fergler
Re: Connecting new copper wire to old aluminum wire
Lots-o-work wrote:

Interesting, it looks like the wire is copper with some sort of plating. So now what? Do I treat this as traditional copper wire and just tap into it?

It seems like my options are to either change out the wiring at the point it enters the sun porch or tap into another circuit where the wiring has already been updated, then cap off the old wiring inside the wall, then leave a access point. The problem with this is that there may already be too many circuits on the new wiring’s breaker. So you know I will be replacing 3 or 4 plugs.

If it is indeed "plated copper" you can proceed as if it were pure copper.
Think of it in the same way as the old K & T wiring solder connections that when made would be taped over with rubber tape then friction tape. Outdated method by todays standards, but standing the test of time.

Re: Connecting new copper wire to old aluminum wire
paretoslaw wrote:

With those questions you will be better served to call someone who knows what the H he is doing.

There are a few people on here that do know what the H there doing.

Generally a good pretwisted splice and a tight wirenut is fine. Want to be sure add a little deox or nolux

JLMCDANIEL
Re: Connecting new copper wire to old aluminum wire
Lloyd wrote:

There are a few people on here that do know what the H there doing.

Generally a good pretwisted splice and a tight wirenut is fine. Want to be sure add a little deox or nolux

If it were cu to al this method is not approved.
Jack

Ernie_Fergler
Re: Connecting new copper wire to old aluminum wire
JLMCDANIEL wrote:

If it were cu to al this method is not approved.
Jack

I agree.
Methinks Lloyd is talking about a copper to tin-plated copper connection here.

Re: Connecting new copper wire to old aluminum wire
Ernie_Fergler wrote:

I agree.
Methinks Lloyd is talking about a copper to tin-plated copper connection here.

Indeed I was but ever happened to those overpriced blue wirenuts that came with deox in them? They still around? I beleive they were listed a listed connector for cu to al splice.

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