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Where to find NMD90 6/3 in these times.

LoganWolf

New Member
Oct 17, 2021
4
2
Ontario
Planning to run 40' of NMD90 6/3 from main panel to garage for a 14-50 plug.

Can't find stock anywhere in the GTA (Ontario). Checked big box and a few local suppliers.

I was able to find 8/3 NMD90 and may go with that. I will be using a mobile charger on the 14-50 so drawing 32A.

I'll be putting in a 40A breaker with the 8/3.

Any ideas where I can source some nmd90 6/3 before I get the 8/3? Wanted to run 6/3 to future proof but with supply issues I might not have a choice.
 

pb2000

Member
Dec 22, 2019
324
342
Calgary
Nmd90 8/3 is good for 50A at 75c. 55A at 90c.

So regardless max circuit is 50A. I guess it would still be safe to continuously charge at 40A with a 50A breaker (80% continuous)
All NM cable is limited to it's 60C rating. If you run individual RW-90 wires in conduit, then you can bump up to the 75C rating, which is the max rating of most breakers.


You could also look at some 4-6 awg Aluminum wire if the price of copper is putting you off, but just keep in mind that you need to be very careful with the terminations and Tesla wall connectors technically don't support aluminum conductors.

 

pb2000

Member
Dec 22, 2019
324
342
Calgary
Code rule to back that comment?
Some of the recent changes to the Canadian code technically allow the 75C rating on NM (seemingly by omission), but it still seems to be a topic of debate and I've yet to find a clear cut answer saying it's allowed. What ultimately matters is the opinion of your local codes officer, so call before you install.
 

X.l.r.8

Supporting Member
Supporting Member
Feb 18, 2018
1,555
998
Toronto/Miami
No Canadian code, but NEC does state that "NM cable mat be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90C, with ampacity limited to that of 60C connectors"
More to the point, why would you pull 3 core for a dedicated 240V circuit?
 

pb2000

Member
Dec 22, 2019
324
342
Calgary
More to the point, why would you pull 3 core for a dedicated 240V circuit?
For me at least, the run was short enough that the cost of buying the tesla 6-50 and the 14-50 adapters was more than just doing 14-50 from the start. It also gives you the flexibility to convert to a sub panel or plug in a load requiring a neutral.
 

TechnoBabble

Member
Mar 11, 2019
64
9
GTA
Some of the recent changes to the Canadian code technically allow the 75C rating on NM (seemingly by omission), but it still seems to be a topic of debate and I've yet to find a clear cut answer saying it's allowed. What ultimately matters is the opinion of your local codes officer, so call before you install.
When was this recent change? 75c rating has always been allowed in Canada for as long as I can remember.
 

pb2000

Member
Dec 22, 2019
324
342
Calgary
When was this recent change? 75c rating has always been allowed in Canada for as long as I can remember.
I'm not going to go back and re-read it all again, but I think the change was made in the 2013 edition. The code specifies nm cable to 10awg can't exceed it's 60C rating, but just stops there and doesn't say anything about 8awg or larger,
 
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