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Discuss 3 phase to single phase in the Commercial Electrical Advice area at ElectriciansForums.net

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sparkysean

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Hi people i have to step down from a 3 phase to a single phase for a 13amp fused spur which will be used for a fire distern.

I have a 3 phase board and would like to install a single phase isolater which will then feed the fusible spur for the fire distern, i would like to know any regulations or advice.

thankyou.
 
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Spudnik

  • Thread Starter Thread Starter
  • #2
Hi Sean(?),

If you have a 3ph DB, as the load will be fairly low, you can just install a single phase 6A MCB on a spare way in the board for the fire alarm system.

Try and make sure you install the same make.
 
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sparkysean

  • Thread Starter Thread Starter
  • #3
cheers for the input jason, great help.
 
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Sparky-Tom

  • Thread Starter Thread Starter
  • #4
Also if you do happen to install any more single phase MCBs to the system in future, try and distribute them across the three phases, to keep the loading balanced.:D
 
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sparkysean

  • Thread Starter Thread Starter
  • #5
cheers tom but could i have a example of balancing the load. Dyou mean by following the phases i.e y1 y2 y3 in order
 
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Guest123

  • Thread Starter Thread Starter
  • #6
Hi Sean.

When you install single phase loads onto a 3 phase DB you are in effect unbalancing the system by having say, a 16A circuit on one phase eg Brown (L1). Should you ever need to install another single phase load to the DB then you should install this on a different phase i.e Black (L2) and for another, Grey (L3) thereby balancing out your single phase loads across the 3 phases.

Cheers
 
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Spudnik

  • Thread Starter Thread Starter
  • #7
Wait till you have to deal with 2 phase 3 wire.

Now THAT is a P.I.T.A.!

:D
 
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sparkysean

  • Thread Starter Thread Starter
  • #8
thanks everyone for the input, i have a new job as a maintenance engineer and my expertise lies in domestic and new builds so for the next few months i'll most probably be asking many questions that you real pro's know straight off your heads, but thankyou again and see you all soon.
 
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Sparky-Tom

  • Thread Starter Thread Starter
  • #9
Sorry I should have explained it a little more in-depth, thanks Lenny! :D

Sean, is this your first time working with 3-phase systems?
 
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sparkysean

  • Thread Starter Thread Starter
  • #10
i have installed 3 phase amoured cables but never actually worked on 3 phase in a maintenance role
 
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