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Nema 5-20 to 5-15 adapter

Nema 5-20 to 5-15 adapter

Hi,

can I use a 5-20 extension cord as an adapter to plug my gen 1 tesla charger with a 5-15 plug into a 5-20 outlet?

I already have a 5-15 adapter for my charger, and I can use this 1 foot extension cord as an adapter. will that work?

https://www.amazon.com/NEMA-5-20-Extension-Power-Cord/dp/B079J2BS54/ref=...

Thank you,
-Sean

murphyS90D | 31. Juli 2018

A 5-15 plug will plug directly into a 5-20 outlet, no adapter is needed.

seanmmvi | 31. Juli 2018

I'm trying to remember, (im at work), but I think the plug in my garage is like this " - | " Not " - + "

tes-s | 31. Juli 2018

As @murphy said, no adapter is needed. The extension cord and outlet are both 5-20, so if it will work with the extension cord, it will work with the outlet.

If it is not a 5-20, then the extension cord won't work either.

Rocky_H | 31. Juli 2018

@seanmmvi, I think I get what you mean. The extension cord you have is 5-20 ONLY? Like the input slots in it are one vertical and one horizontal, without either one being the shape of a T? So a 5-15 plug could not fit into it, because it won't fit the two vertical blades into it?

That's a little unusual extension cord to have, but I have seen cords like that, which are 5-20 only. Most of the time, 5-20 outlets and cords are made with the T slot, so they can be backward compatible to accept 5-20 or 5-15 plugs.

So I guess this brings up the more obvious question: Why are you wanting to use the lower amp Tesla 5-15 adapter if you know the outlet really is a 5-20? Why don't you order the Tesla 5-20 adapter, so you can go ahead and draw 16 amps instead of 12 amps?

tes-s | 31. Juli 2018

The extension cord requires a 5-20 outlet, but will accept a 5-15 or 5-20 plug.

seanmmvi | 31. Juli 2018

if you put a 5-15 plug into a 5-20 outlet, will you have access to the full 20amps?

murphyS90D | 31. Juli 2018

No, you need the 5-20 adapter for the UMC to use the 20 amps (actually 16 amps).
A device that has a 5-15 plug on it can not be UL approved if it draws more than 15 amps.

Rocky_H | 31. Juli 2018

@tes-s, Quote: "The extension cord requires a 5-20 outlet, but will accept a 5-15 or 5-20 plug"

Why are you just saying that? You don't know. What the OP is saying is that it is 5-20 specific. I have seen that they do make some extension cords so that they have ONLY a vertical slot and a horizontal slot, so it enforces that you can only use 5-20 plugs on them, not the T shaped slot that would allow 5-15 or 5-20.

tes-s | 31. Juli 2018

I do know. He posted a link to the extension cord.

Any 5-20 extension cord I have seen has a 5-20p and a 5-20r. The 5-20p will fit a 5-20r and not a 5-15r; the 5-20r outlet will accept a 5-20p or 5-15p.

I have never seen a receptacle that would accept a 5-20p and not a 5-15p.

tes-s | 31. Juli 2018

BTW, my WAG is the outlet is not a 5-20, which is why his 5-15 won't fit. Perhaps a 6-20?

Rocky_H | 01. August 2018

Hmm, I thought he was talking about two different extension cords--a long 5-20 only one (not linked) and then the short pigtail adapter one he linked to. But I think you may be onto something there if the outlet may not even be a 5-15 or 5-20 at all, but could be a 6-20.

jayxu1990 | 16. Mai 2019

@murphyS90D so you are saying tesla's 5-15 adapter, when connected to a 5-20 outlet will not be able to use to draw more than 15 Amps and it could cause an issue if it did? I personally don't think the ~4 amp difference would require any material change, and I assumed that the only difference between 5-20 and 5-15 tesla adapter is the form factor. Would like to be proven wrong though

murphyS90D | 16. Mai 2019

The adapter has a resistor in it that tells the EVSE / car what the maximum current is. To get 16 amps from a 20 amp receptacle you must use the 5-20 adapter.