Discuss Fluorescent tube light help in the Electrical Forum area at ElectriciansForums.net

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Delboy247

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Hi there went a job today to supply a light box for a shop today, it has 30 fluorescent tubes inside it done the cable calc 30 x 58watts = 1740
1740/240=7.25
So I fitted a 10amp rype b mcb and it tripped so I clamped the load going out it was reading 10.8amps and on start up it was hitting 11-12 Amps.
Now I'm thinking of fitting a 10amp type c mcb will this do it
Has anyone come across this??
 
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Strima

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Arms
Esteemed
C type should be OK but you need to check your Zs is suitable for the MCB.

What do the manufacturers recommend?
 
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egginyourface

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  • #3
multiply 7.25 amps by 1.5.
 

Jimmy Boy

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Arms
Firstly can I ask if you are electrically competent and/or qualified to carry out this work ?, I ask because I would like to know if you have established the cable sizes and protective device characteristics required for this load.
J
 
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egginyourface

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  • #6
Test your zs at the last light. maximum zs for 10 amp ctype is 1.84 ohms
 

Jimmy Boy

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Arms
Has this been a new install?
Well this what I am driving at ! Is someone lobbing a huge light box on the end of some random existing cable ? for all we know it might be a bit of .5 flex lol !. If the OP can give us the supply cable size 1.0 or 1.5 this will help us determine stuff.
J
 
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egginyourface

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  • #10
but to determine your highest reding u need to find the last point
 

plugsandsparks

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Arms
Esteemed
Depending on the type of light you need to take into account the load of the ballast, if appropriate or the HF unit. Also the power factor will also conspire to increase the current above the basic calc of adding up the tubes and dividing by the voltage.

With a tube load of what you have described i would have put it on a C16 on 2.5sqmm cable, depending on cable length.
 
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Delboy247

  • Thread Starter Thread Starter
  • #15
The box is pre wired in 1.5mm t + e, I run in a 1.5mm fp cable 10 metre run to the first connection done r1 + r2 at the furthest point all good turned it stuck a clamp metre on the load side with it reaching 10.8 amps.
 
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