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

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

    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. ?
    Last edited by papa; 07-24-11, 06:41 PM.

    #2
    sorry, voltage is 120

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      #3
      I think you need to check your ballast info

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        #4
        On a 208y/120 system? Sounds like around 8A on 3 ungrounded conductors.

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          #5
          This is a single phase panel I will be coming out of 120/208, also did not have the fixtures yet so did not ballast amps.

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            #6
            I was thinking(maybe not too clearly lately), that although you should be fine, you need to have ballast information to verify.

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              #7
              Originally posted by papa View Post
              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. ?
              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?
              [COLOR=navy]If you aim at nothing, you will hit it every time![/COLOR]

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                #8
                Originally posted by papa View Post
                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. ?
                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].

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                  #9
                  Originally posted by Little Bill View Post
                  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?
                  Im talking about switching just 2 of the 4 lamps in a single fixture.

                  MBC - multiwire branch circuit

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                    #10
                    Originally posted by papa View Post
                    Im talking about switching just 2 of the 4 lamps in a single fixture.

                    MBC - multiwire branch circuit
                    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.
                    [COLOR=navy]If you aim at nothing, you will hit it every time![/COLOR]

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                      #11
                      Originally posted by Little Bill View Post
                      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.
                      Thanks, sorry bout the confuson , I left the W out

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