swimmer -

I think that #6AWG Copper is a requirement in this case because based on the document that is what the manufacturer requires ( NEC 110.3(B) ), regardless if the code book were to indicate something smaller is adequate.

Setting aside the listing requirement in order to use the 90C column all terminations need to be listed as being rated for 90C. This is rarely the case. Many components are only listed for 75C or even 60C.

Cheers!

Jim

 

swimmer -

I think that #6AWG Copper is a requirement in this case because based on the document that is what the manufacturer requires ( NEC 110.3(B) ), regardless if the code book were to indicate something smaller is adequate.

BINGO!

Setting aside the listing requirement in order to use the 90C column all terminations need to be listed as being rated for 90C. This is rarely the case. Many components are only listed for 75C or even 60C.

BINGOX2! NEC 110.14 (C)(1)


Cheers!

Jim

Use caution when using the 90deg column.

 

For circuits 100amps and below use the 60degree column, 110.14(C)(1) terminal temperature limitations.

 

Read that section again. The 60° column being used for 100A and under is not automatic. It's only IF the terminations are not marked. Most now days are marked and are 75°.

 

Just checked a Cutler Hammer catalog for the breaker and saw the 60C rating. I also saw 75C stamped on the NEMA 14-50 receptacle.

Thanks for the clarification

 

I always use #6 for 50 amp Tesla charger outlets.
The cost between # 8 and #6 would be very minimal for '25'

 

I always use #6 for 50 amp Tesla charger outlets.
The cost between # 8 and #6 would be very minimal for '25'

Agree with you 100%.
I thought everybody would use #6 awg for this.

 

90 degree column is for derating only. 75 degree column is for over 100amps. 110.14(C)(1) terminal temperature limitations

 

#8 is good for 50 amps as long as it isn't nm cable or se cable. You can use the 75C if the thhn is install in a raceway, the panelboard is rated 75C and the breaker is rated 75C. Unless this is a really old panel #8 would work.

How long is the run? The specs may call for #6 because they are using the worst case scenario--NM cable. In that case it must be #6. If it is very near the panel then just run #6-- a few bucks different

 

Only place I ever see 90° terminations is MV. I don't think they exist on 600V class gear.

So my rule of thumb is if your ampacity ever exceeds the 75° column you probably have to upsize your conductors.

 

Do t forget the continuous load correction. I'm sure it charges for 3 hours and longer

 

Which type of Rome and why?

 

Idk, sounds a little funny

 

This is a branch circuit. Look at table 210.24. It doesn't matter the wiring method. 50 amp branch circuits require #6 copper. If you have a wiring method @75C, it still needs number #6 copper for a branch circuit. Use 310.15 (b)(16) to determine the allowable ampacity of your conductor, nothing more. 310.15 (b)(16) is the most abused table in the NEC IMO.

 

I would not deem the Tesla connection a branch circuit:

It's unique and ONLY connects to Tesla road machines.

There's only the one Tesla specific device on the circuit.

So, I'd have to deem it a device specific circuit with device specific installation instructions.

&&&&

Romex is so MUCH easier to install than pipe & wire that #6 in Romex is going to be the lowest cost install versus #8 in EMT.

It won't even be a close calculation.

In new construction, hereabouts, the Service is set as a semi-flush panel in the exterior wall of an integral garage. The length of run to the Tesla port, if spec'd ( never would happen in tract housing ) would be trivially short. Romex in #6 would be the norm in such an instance.

As an after-the-build installation I would expect to see surface mounted EMT as standard. Hereabouts, our walls are all closed up -- even the garages. In which case, #8 THWN-2 within EMT would be expected. Hereabouts, exposed Romex is flatly prohibited -- even if it's up inside the rough framing and overhead, and the reason why even garages are fully 'rocked in.'

 

A device specific circuit is still a branch circuit right? I've never heard that term, device specific. Most say dedicated circuit, the code says individual branch circuit.

New construction in California has several specific requirements for car chargers. IIRC, a 1" conduit with all junctions/pull bodies in readily accessible spaces unbroken from a panel with enough ampacity for 240v 60A (I think) to a jbox in the garage. Oh, and two spaces in the panel it comes from has to be labeled "Provisional EVCS" or some wording to that effect. Same label for the garage j box.

 

That's a funny statement. Does your state promote things that are dangerous to pregnant women?

Can someone help me understand why table 210.24 doesn't apply (2011).

 

That's a funny statement. Does your state promote things that are dangerous to pregnant women?

You misunderstood. There is nothing dangerous to pregnant women in my chair. It's only banned in California because the state is filled with liberal idiots. No pregnant women have been hurt by my chair in any other state.

 

My mistake. That table is for multi outlet circuits.

Just about every retail building in California has a placard on it that says "Things in this building have been known to cause cancer." Paraphrased. It's ridiculous.

 

Dennis,
Do you mean the ones that are equal sizes to like a pc tower? When I think of smaller or less expensive ones I think of 500-1500$ ones that Costco sells...

 

I think it's funny to see litre soda bottles in undercounter wine coolers.

 

I've seen Miller Lite in wine coolers. It's all good. If the spec called for a dedicated circuit, I'll run one. While I agree with what Dennis said, I'll stick with the manufacturer's instructions.