AC90 To A 240V Outlet 10/3 Instead Of 10/2, And Clamps?????? - Electrical - DIY Chatroom Home Improvement Forum
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Old 02-05-2019, 02:54 PM   #1
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AC90 to a 240V outlet 10/3 instead of 10/2, and clamps??????


Is having AC90 10/3 instead of 10/2 a reasonable fix?


It is for wiring from electrical panel to the attached garage for a 240V outlet, I purchased an older style Lincoln Arc Welder.


The reason is I saw a loop of AC90 on the sale rack for 50% so I got 10 meters for CDN$20 instead of $45 at Home Depot.

What are the clamps to buy for AC90?
I was thinking plastic like these...
https://www.homedepot.ca/en/home/sea...nduit%20clamps
But there is another style, where its one nail, plastic and a "P" style.

Outlet - Large slot on the right side, I have is White, round hole hole middle bottom is black, and small slot on the left side I have is Red. Bare copper wire is unused. I better change that around and use the bare copper wire as to not confuse or endanger anyone else who runs across it in the future.

Circuit Breaker - We have matched the recommended 50A 2 pole circuit breaker that our electrician initially installed for the Mike Holmes whole house surge protector. Must've been an up-sell on the electricians part. The circuit breaker is $65 at Home Depot, so saved a bit there.

240V Outlet
https://www.princessauto.com/en/deta...et/A-p0141200e

AC90 is 10/3 so 3 insulated 10 gauge and a 4th bare copper which is smaller gauge.

https://www.homedepot.ca/en/home/p.a...000433041.html

Cabble clamp, connector for housing

https://www.homedepot.ca/en/home/p.3...000138185.html

AC90 Insulated Bushing Readhead
Well I do see them online, I must've missed them in the store

https://www.homedepot.ca/en/home/search.html?q=bushing

Last edited by markz; 02-05-2019 at 03:03 PM.
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Old 02-05-2019, 03:43 PM   #2
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Re: AC90 to a 240V outlet 10/3 instead of 10/2, and clamps??????


You can use these for clamps rather than the PVC ones you pictured.
https://www.homedepot.com/p/RACO-AC-...4461/205665234

Or these, as they are cheaper. https://www.homedepot.com/p/AC-MC-3-...81CP/203671663

The adapter you show is for NM cable. You may want to look into the variations of this for your set up. https://www.homedepot.com/p/RACO-Fle...11CP/203671657

Yes, cap off the neutral and use the ground in the place it was intended. The welder probably doesn't use a neutral unless it has electronics on it. What is the amperage draw of the welder. The 10 gauge wires will limit you to 30 amps. Mine is 50 amps, so a larger cable is needed.
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Last edited by chandler48; 02-05-2019 at 03:46 PM.
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Old 02-05-2019, 07:29 PM   #3
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Re: AC90 to a 240V outlet 10/3 instead of 10/2, and clamps??????


Lowes had the Anti Short Bushing, fits well. Along with BX(AC90) Strap/clamps, two hole fastener. Messed up on the receptacle bushing, only listed as LOOMEX(NMD90) they are plastic and have a firm flap inside them, wont use them.



I was going to post a picture, but I dont know how to with a web address so I will just describe it. There is the a hole I had to punch out of the receptacle, the bushing/clamp was a 3/4" as I originally was going to use LOOMEX, so you say I can't use that one I linked to. I will have to find something else then. I can see how its not wise to use what I have there now as it can be over tightened, separate and cause a short.


Hey thanks for the link you gave me, "Flex and AC Cable 3/8 in. Set Screw Connector (100-Pack)" I can see it acting as a strain relief. I do not see anything on Home Depots Canada sight, but I will swing around there tonight and have a look. Just has to say AC or BX on it right, LOOMEX NMD90 is regular insulator style with whatever combo wires inside, no armor. Maybe I should have looked harder where I found the red heads, and straps.


Thanks for the help on the receptacle clamp/bushing.


One last question, how much wire should I loop inside in the receptacle?



The Lincoln AC220-S is the welder I have, the instuctions state I need #10 or if its longer then 100' I gotta use #8 gauge wire. I will double check that right now. Quoted for you here.


Quote:
receptacle (NEMA 6-50R Type) to the power lines at the fuse box. Three #10 or larger copper wires are required if conduit is used. For long cable runs over 100'(31m), #8 or larger wire in
conduit will be needed to prevent excessive voltage drops.
Fuse the two hot lines with 50 ampere super lag type fuses as shown in the following diagram. The center contact in the receptacle is for the
grounding connection. A green wire in the input cable connects this contact to the frame of the welder.
This insures proper grounding of the welder frame when the welder plug is inserted into the
receptacle. If a separate disconnect switch is used, it should have
two poles for the two hot lines and both should be fused for 50
amperes.

So yes, I checked to see if the internal is grounded to the case. I just noticed it stated three 10 gauge conductors, my 10/3 has three 10 gauge but the bare is like 12 or 14 gauge. Interesting.
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