4ea 40a 240v outlets on one circuit?

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joecalvin

joecalvin

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Austin Tx
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Ok, we have a customer/builder (residential) that is building a 5 car garage/workshop and wants 16ea 40a 240v receptacles. He wants us to put 4ea outlets on each home run circuit. I told him this was against code but i am not sure if it is or not. So, I am trying to figure the best way to wire the the circuits. Should I do a home run to a junction box, use polaris taps to branch off to each plug, then run the wire to each of the 4 plugs from the junction box?

Is this legal by code? if so....wiring suggestions?

Thanks
Joe
 
As a practical matter, try not to divide the circuits up purely by location, to best accomodate two pieces of equipment in one small area.
Think of kitchen SABC layout.
Also consider fairly permanent circuit labels at each receptacle.
 
joecalvin said:
Ok, we have a customer/builder (residential) that is building a 5 car garage/workshop and wants 16ea 40a 240v receptacles. He wants us to put 4ea outlets on each home run circuit. I told him this was against code but i am not sure if it is or not. So, I am trying to figure the best way to wire the the circuits. Should I do a home run to a junction box, use polaris taps to branch off to each plug, then run the wire to each of the 4 plugs from the junction box?

Is this legal by code? if so....wiring suggestions?

Thanks
Joe
Click to expand...
I've never seen a 40 Amp 240v receptacle.

Sent from my SM-A326U using Tapatalk
 
A code rule to ponder:
210.23(C) - it looks like multi outlet receptacle circuits of 40A or 50A are only permitted for cooking equipment in dwellings.
Subpart (B) would allow multiple 30A outlets for any equipment as long as no item draws more than 80% of the circuit rating (good luck enforcing that one...).
 
I have no proof to offer but have heard the IRC prohibits multiple 240V receptacles over 20A, so if true & under the IRC would be a problem. Or this is a urban legend, hopefully someone with access to the IRC could confirm or shoot it down.
 
norcal said:
I have no proof to offer but have heard the IRC prohibits multiple 240V receptacles over 20A, so if true & under the IRC would be a problem. Or this is a urban legend, hopefully someone with access to the IRC could confirm or shoot it down.
Click to expand...

here’s the electrical parts

CHAPTER 37 BRANCH CIRCUIT AND FEEDER REQUIREMENTS - 2015 INTERNATIONAL RESIDENTIAL CODE (IRC)

ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures.
codes.iccsafe.org codes.iccsafe.org

BA065B40-EB7B-49B2-A75D-75EBFA9D2EEC.jpeg
 
Another approach: use 'RV panels' for each receptacle. This puts the receptacle in a box with the OCPD and makes the conductors to the box a feeder rather than a branch circuit.

You could even take advantage of 'tap rules', running a single 150-200A feeder along the ceiling, tapping off 50A conductors for each location. Then any combination of locations could be used as long as the total load is low enough.

Jon
 
winnie said:
Another approach: use 'RV panels' for each receptacle. This puts the receptacle in a box with the OCPD and makes the conductors to the box a feeder rather than a branch circuit.

You could even take advantage of 'tap rules', running a single 150-200A feeder along the ceiling, tapping off 50A conductors for each location. Then any combination of locations could be used as long as the total load is low enough.

Jon
Click to expand...
Nice out of the box thinking!
 
I'd be inclined to put a couple of 100 amp subpanels in the garage, 1 near each end, and run a separate home run in #8 AL SER to each receptacle. Put half the receptacles in each panel.

I'd bet materials would cost less than any kind of tapping or splicing, pigtailing, etc.

I'd also bet it would take less time
 
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