6-50 vs 14-50: which is better

kyrral

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#1
They both support a 50 amp breaker. I don't see any reason not to use the 3 wire 6-50 rather than running an extra wire (for new wiring) for the 14-50. Or is there?
To reiterate: 8 gauge copper wire is ok for a 50 amp breaker. 3rd item: I need to find an old 50amp 2 pole Sisco breaker for my panel. Any ideas?
 

Ed Woodrick

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#2
Run the extra wire!

The 14-50 is more flexible than the 6-50, first. The 14-50 is a standard adapter that comes with the Model 3. But the 14-50 has neutral, which can allow you to use the same plug for other functions. You can split a 14-50 into two high current 120V outlets with a simple adapter. The 6-50 will only be 240V.

You just spent $60k+, don't skimp on $20 for a single wire.
 
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#3
When I had buy Model S delivered aver 5 years ago, Tesla recommended a 6-50 outlet in preparation for for HPWC which they had not shipped yet. They also included a 6-50 adapter with the car. This is what I installed with 3 garage wire in preparation for the future HPWC running with a 100A breaker. When the HPWC finally arrived, it was just a matter of removing the 6-50 outlet and wiring the HPWC directly.

I haven't opened my bag of connectors in the Model 3, but I think it included a 14-50. You would have to purchase a 6-50 adapter if you use a 6-50 outlet. This is something to consider, especially since 14-50's are common in RV parks.

But to answer your question directly, I would say that with a 6-50 you save you a little bit of money if you have a long cable run. You may need to use 6 gauge wire for any 50A circuit in certain situations and wire types. See this chart for amps vs. wire size:
https://www.cerrowire.com/wp-content/uploads/2018/09/ampacity091418.pdf
 

kyrral

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#4
Alex and Ed, I'm convinced. 14-50 it is. My adapter for 14-50 has 30 amp in tiny print. Its still ok for 50? I'm not sure what the temperature ratings refer to on amp size (60, 75 and 90 degrees). It looks like I'd be safe using 8/3 THHN rated at 55 amp for 90 degree centigrade. I see NM-B rated at 40 amps. Am I in danger or is there a conflict here. There are lots of online suppliers of 8/3, not so many at 6/3. Also does it matter if the wire is solid or stranded.
I know the car cost $60k, but I got here by being thrifty...the habit is hard to break.
 
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#5
Alex and Ed, I'm convinced. 14-50 it is. My adapter for 14-50 has 30 amp in tiny print. Its still ok for 50? I'm not sure what the temperature ratings refer to on amp size (60, 75 and 90 degrees). It looks like I'd be safe using 8/3 THHN rated at 55 amp for 90 degree centigrade. I see NM-B rated at 40 amps. Am I in danger or is there a conflict here. There are lots of online suppliers of 8/3, not so many at 6/3. Also does it matter if the wire is solid or stranded.
I know the car cost $60k, but I got here by being thrifty...the habit is hard to break.
Took this picture of my Model 3's Mobile Wall Connector Adapter. You're right. The 14-50 adapter says 30A. The mobile wall connector will provide a maximum of 32A with the 14-50 adapter. So I'm not sure what this 30A 250V means (it probably means 30A@250V, which is about 32A at 234V). In any case, you'll be OK with the 8/3 wire, especially if you only use the socket with the Mobile Wall Connector.
upload_2018-10-9_17-18-24-jpeg.15813
 

MarkB

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#6
I currently have a plug in ChargePoint charger that uses a 6-50. Purchased it when I got my Leaf.

When I had the electrician do the installation, I had him run wire in preparation for a 14-50, but to install the 6-50 (I have the 14-50 receptacle).

I sold the ChargePoint, planning to replace it with a Tesla Wall Connector (mainly to avoid dealing with the J1772 adapter every time I plug in at home).

My plan was to convert the Tesla Wall charger to a plug in, like this link, and this one.
 
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#7
Alex and Ed, I'm convinced. 14-50 it is. My adapter for 14-50 has 30 amp in tiny print. Its still ok for 50? I'm not sure what the temperature ratings refer to on amp size (60, 75 and 90 degrees). It looks like I'd be safe using 8/3 THHN rated at 55 amp for 90 degree centigrade. I see NM-B rated at 40 amps. Am I in danger or is there a conflict here. There are lots of online suppliers of 8/3, not so many at 6/3. Also does it matter if the wire is solid or stranded.
I know the car cost $60k, but I got here by being thrifty...the habit is hard to break.
It is marked that way because that's how much current the charger will draw. The connector (both the wall side and the plug itself) are rated for 50A of current, but the mobile charger typically draws 30-32A when in use.

Also, keep in mind that the continuous load on a circuit should not exceed 80% of the breaker rating, in this case, that's 40A.