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3 phase lighting circuit

Discussion in 'LEDs and Optoelectronics' started by bal, Apr 23, 2010.

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  1. bal

    bal

    1
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    Apr 23, 2010
    Hi,

    I'm a technician in a factory and have been tasked with sorting the lights out. We have approximately 60 x 250 w single phase halogen lights which I would like to control via contactors. Without going into detail the following is my take on things:

    I've got a basic design where I have 3 phase plus neutral coming into a control box, this would then be split into 6 single phase feeds - two from each leg of the 3 phase feed. Each single phase supply would feed one contactor which in turn would switch 10 lights (6 contactors - 60 lights). For load balancing each leg of the 3 phase supply would therefore feed the same number of lights (20 lights each).

    Each radial light circuit would be protected by a B6MCB. The single phase feeds (one per contactor) would be protected by a B25MCB each.

    Should I be looking at protecting the incoming 3 phase feed with a 3 pole plus neutral MCB or should a simply fit 3 individual fuses on the 3 lives??

    I understand that if I use a 3 pole plus Neutral MCB if one phase is overloaded the whole breaker will trip. If I use 3 individual fuses and one blows wont the remaining phases be unbalanced??.

    Any thoughts would be appreciated. I

    Hope I haven't lost anyone lol!!

    regards
     
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