Wiring layout question

[supratreo]

So I'm slowly wrapping up wiring my shop and and was planning a small under sink electric WH.
i ran the 6/3 for that as i had it on hand and would get the job done. while thinking about how i would need to connect this romex to the WH i realized that i may be able to reroute it to the space above the ceiling, add a box and split it 2 ways. i was already thinking about adding an outlet for a welder on the opposite side of my shop by doing a dedicated run but that would cost me a 125' roll of wire.
if i split this one it would cost me less than half that.
not only that but i can put a plug on the WH and use that outlet for welding as well. I figure this way i would get the most out of this circuit.
the WH I'm looking at draws 43A i believe, if you have opinions on these please let me know. i'lve only ever used larger, gas tankless heaters. This will just be for a hand sink in the shop.

next question is, if i am able to split this run to the other side of the shop, can i use 6/2? obviously i would mark the white conductor appropriately.
also, what size J box would i need? i've never spliced or split conductors this big but i douby a 4x4 would do it.

thanks

 

[wyliesdiesels]

So I'm slowly wrapping up wiring my shop and and was planning a small under sink electric WH.
i ran the 6/3 for that as i had it on hand and would get the job done. while thinking about how i would need to connect this romex to the WH i realized that i may be able to reroute it to the space above the ceiling, add a box and split it 2 ways. i was already thinking about adding an outlet for a welder on the opposite side of my shop by doing a dedicated run but that would cost me a 125' roll of wire. if i split this one it would cost me less than half that.

not only that but i can put a plug on the WH and use that outlet for welding as well. I figure this way i would get the most out of this circuit.

the WH I'm looking at draws 43A i believe, if you have opinions on these please let me know. i'lve only ever used larger, gas tankless heaters. This will just be for a hand sink in the shop.

next question is, if i am able to split this run to the other side of the shop, can i use 6/2? obviously i would mark the white conductor appropriately.
also, what size J box would i need? i've never spliced or split conductors this big but i douby a 4x4 would do it.

thanks

43a for an under the sink WH? you sure thats correct? those units are tiny. I highly doubt it draws that much for a small 1-5 gal tank. that would be way overkill. Even a 60gal tank water heater doesnt draw that much power.

what is the make and model of the WH?

if it doesnt draw that much power, 6/3 is way overkill for it and you will have issues terminating that large of wire to it

 

[Leaflessshadetree]

I could check but my small tankless required a 40 amp breaker. It does OK for hand washing but sometimes I wish I'd put in a larger one.

 

[PCustoms]

@wyliesdiesels seems like he's probably talking about tankless based on the balance of his post

 

[supratreo]

Yes, i'm looking at tankless/on-demand/under sink..
something like this: https://www.supplyhouse.com/Eemax-H...e-II-Electric-Tankless-Water-Dual-Heater-11kW

 

[Codyboy]

I would do it. But i do redneck stuff all the time.
Should be fine as long as only welder or WH is not used at the same time.
I'd probably also cram it into a 4x4 deep box.

 

[supratreo]

of course.
seeing as how the welder only needs 3 conductors, i'm assuming its fine to run 6/2?
are there other ways to make the connection besides split bolt and Polaris taps?

 

[mm08822]

Did you run 6-3 NM-B? If so, it technically by code needs to be sized at 125% which is 57.5 A. #6 Cu nm-b is only rated for 55A max. #6 Cu THHN is rated for 65A.

 

[supratreo]

Thank you for that info. yes i did run6/3 NM-B. this is for a WH application only? if so, i can find one that suits the code requirements.

 

[mike93lx]

6/2 is crazy overkill for nearly all welders. You can downsize the wire based on duty cycle, but it needs to be on a dedicated circuit.

Small subpanels are cheap. If you go into it with the 6/3, then you can add a breaker for the WH (and use conduit with more flexible stranded thhn), then run a welder circuit with 10/2,or maybe even 12/2

 

[supratreo]

good point. i have a hobart 210mvp and it uses 24A. not sure why i thought i needed so much amperage.
i like the sub panel idea, i'll look into that.

 

[mike93lx]

good point. i have a hobart 210mvp and it uses 24A. not sure why i thought i needed so much amperage.
i like the sub panel idea, i'll look into that.

Welders are an entirely different animal. They allow wire sizing based on duty cycle

 

[wyliesdiesels]

run #6 THWN in conduit to a subpanel, then feed the WH with the same #6 THWN in conduit or youll need to use 4/3 NM-b (which is very expensive)

feed the welder from the same subpanel

 

[supratreo]

Thank you.
sounds like the 6/3 might be too much for the welder but i'll run it to the other sub just so i have it available there. i did want a small lathe and mill there at some point too.