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Sir Sparks
Sir Sparks, President/Owner/ Master Electrician
Category: Electrical
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Experience:  US State Certified & UK Electrical Contractor for all electrical fields/disciplines
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according to the nec, all 220v appliance require a 4 wire hook-up

Customer Question

according to the nec, all 220v appliance require a 4 wire hook-up Is this information correct? and what section of the nec can that be found.
Submitted: 3 years ago.
Category: Electrical
Expert:  Rich replied 3 years ago.

Rich :

Hello ... 250.113 specifies the use of an equipment grounding conductor

Customer :

hi, so is three wire ok ?

Rich :

Is this new or existing ?/ are the walls open and the wiring accessable ?

Customer :

existing open walls.

Customer :

did you get my follow up question? about the powerwasher?

Rich :

If it is popssible top rewire the appliance to 4 wire feed then you shouild do that

Rich :

That is the existing code

Customer :

ok... 4 wire becuase it is near water?

Customer :

the boss and i got into a bit of an arugument about it today. i feel like 4 wire would be safer. 2 hot, one netural one ground. but i cant prove my theory.

Customer :

and one other question there needs to be a disconnect if more than 50 feet of panel?

Rich :

oopsy ,, that is 250.114

Customer :

can i look that up myself?

Rich :

The equipment grounding was always there ... it is the neutral that is now required to be separate ..

Customer :

ok... how about in a wet area. like a car wash?

Customer :

and when was the revision

Rich :

a car wash building would have many more requirements

Rich :

what is your situation ... ?? are you the owner or the contractor?

Rich :

the revision was when the community or state adopted the 2008 NEC

Rich :

are the cars driven thru the car wash ... or dragged thru by a belt ?

Expert:  Rich replied 3 years ago.
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Customer: replied 3 years ago.
it's not a car wash. its a pressrewasher. 6hp. inside a building. we make industrial soap products. i turned the breaker to the off postion, to move the pressure washer. then i checked for voltage with a meter. and removed the wires. to move the equipemnt. that is when i noticed only 3 wires. instead of the four.
Expert:  Sir Sparks replied 3 years ago.
Hi. Your pressure washer quite likely does not require a neutral so in this case 3 wire is correct; 2 hots and a ground.
Expert:  Sir Sparks replied 3 years ago.
Rich is correct with what he said by the way but a pressure washer is Equipment not an Appliance.

There needs to be a local means of diconnect (a plug and receptacle is sufficient) within 50 ft and in line of sight of the this Equipment.

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