MBC for 18 4ft. 4 lamp dual ballasts T8's

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papa

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South Carolina
Would you see any probem with pulling one 20 amp MBC for 18, 4 lamp, 4 ft. dual electronic ballast fixture, and switching the ballast separetely with two switches. ?
 
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USMC1302

USMC1302

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Location
NW Indiana
I was thinking(maybe not too clearly lately), that although you should be fine, you need to have ballast information to verify.
 
Little Bill

Little Bill

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Tennessee NEC:2017
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Semi-Retired Electrician
papa said:
Would you see any probem with pulling one 20 amp MBC for 18, 4 lamp, 4 ft. dual electronic ballast fixture, and switching the ballast separetely with two switches. ?
Click to expand...

Are you talking about switching just 2 of the 4 lamps in a single fixture, or do you mean switching 9 & 9 fixtures? What is MBC-? branch circuit?
 
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dana1028

Senior Member
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San Francisco Bay area
papa said:
Would you see any probem with pulling one 20 amp MBC for 18, 4 lamp, 4 ft. dual electronic ballast fixture, and switching the ballast separetely with two switches. ?
Click to expand...

As others have said, you really do need the ballast info to be certain.

That said, I went to Grainger - a 4-lamp, 120v ballast is rated at .91A each....
.91 x 18 fixtures = 16.38A total....so putting these on 2 ckts should be fine.
[input watts per ballast was 112w....arithmetic still works just fine].
 
Little Bill

Little Bill

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Tennessee NEC:2017
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Semi-Retired Electrician
papa said:
Im talking about switching just 2 of the 4 lamps in a single fixture.

MBC - multiwire branch circuit
Click to expand...

That's kinda what I thought but wasn't sure.
Thought multiwire too, but used to seeing MWBC.

BTW, I don't see a problem with what you described.
 
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