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Discuss lighting in the Commercial Electrical Advice area at ElectriciansForums.net

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snatch

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recently upgraded the workshop lighting. 3 banks of lights. each bank being supplied by a different phase. used a three gang switch to operate with all three phases. a question has been raised if this is against regs having all three phases in one light switch. i can understand the reasoning but is it against regs?
 
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TonyM58

  • Thread Starter Thread Starter
  • #2
Dont see that its AGAINST the regs, although there should be a warning notice on the switces with 'Danger - 400Volts present' or similar, the same as you would with sockets on different phases
 
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snatch

  • Thread Starter Thread Starter
  • #3
thank you for your reply. i have put a notice up saying 400v on switch. i too can not see anything against regs. nice to get one over on people who slag you off but never seem to do.

only just joined this forum and can already see its a good a tool.

thanks once again.
 
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rumrunner

  • Thread Starter Thread Starter
  • #5
Hi snatch,
im not saying theres anything wrong with what you have done ,but in years to come if the label falls off or a inexperianced electrician happens to mess with it ,it could be hazardous i suppose
I think i wold be inclined to play safe and use a contactor to switch the lights.
all the best
rumrunner
 

ian.settle1

-
Mentor
Arms
Hi snatch,
im not saying theres anything wrong with what you have done ,but in years to come if the label falls off or a inexperianced electrician happens to mess with it ,it could be hazardous i suppose
I think i wold be inclined to play safe and use a contactor to switch the lights.
all the best
rumrunner
Rumrunner

Labels have been stuck on switches like this for many years gone by and will be done for many years to come.

One problem using a contactor is supply to contactor coil fails and hey presto no lights at all, the way stated one phase goes down at least two rows of light still lit.;)
 
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rumrunner

  • Thread Starter Thread Starter
  • #7
hi ian,
im not saying theres anything wrong with what you have done ,and i presume you have a nice clean dry workshop ,in some places ,like say a foundry ,farm and damp dirty places,labels are not much good for long,and why would a coil burn out ,your much more likley to burn a switch out ,especially with an heavy inductive load such as flouresent lighting,use 3 contactors if you want to ensure some lights will stay on if theres a fault,you can even fit a time clock easy then ,just in case you forget to turn them off ,do your bit for the planet and all that
rumrunner
 
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Malcg

  • Thread Starter Thread Starter
  • #8
Hi

You have 400v across terminals in the multi-switch at several points in very close proximity and inductive loads.

I am pretty sure your switch accessory will NOT be rated for 400v so your in breach of Section 5, BS 7671 by inappropriate selection.

Why not have three single switches with one phase each?
 
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Darius-parky

  • Thread Starter Thread Starter
  • #9
I am sure engraving "Danger 400v" on a switch will only cost few £s. Doing a safe and professional job like that will convince the client to accept the costs.
 
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wayne

  • Thread Starter Thread Starter
  • #10
part of ongoing mantainance is replacing labels ,anally retentive i know!!!!!
 
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