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    star delta starter

    As Bugsy said.....more info required? Just to give you a bit of an idea,we have a compressor at work which has a 30kw motor on a star/delta setup and is supplied by 63amp HRC fuses motor rated to 100amp. The supply will be too small if your connecting a 60amp 3-phase supply to a 55kw motor....on...
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    Cable size-disagreement

    All the final circuits are within 10 mtrs of the DB....which shouldnt create too much of a problem with cable sizes on the distribution side. As the sub main cable is the most expensive part and is practically the end of the circuit,the v drop allowance can be close to the max of 5%....surely...
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    Cable size-disagreement

    35mm and 70mm have been suggested....90 thermosetting On impedance rating (z) does that incorperate a poor power factor if none is given? what volt drop did you get on the 50mm? 5-core cable used....regarding earth Thanks Scottsparky
  4. P

    Cable size-disagreement

    Buried..... Thanks for the reply Sintra
  5. P

    Cable size-disagreement

    A new sub-main 3-phase supply to be installed on a large commercial site.....to supply a new food outlet (small building) Sub main to be wired in SWA Length of run 160 meters Max load 65-70amps per phase (information supplied by catering company) no diversity has been applied by them.Also no...
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    Garage Supply Made In to TT system.. why ??

    To be honest....if your earth loop impedance (Zs) value is low enough,i think it is totally acceptable to extend your earthing system to an outbuilding.I actually prefer to extend off the existing earthing system. Both systems are acceptable but i wouldnt join the two.. On the other hand as...
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    need help filling out a test form

    Hi Mate, Just like to say what Kris said was spot on...but to briefly add to that the main 100amp fuse your talking about is more than likely a BS88 type fuse plus the prospective fault current reading you acquire in KA should be less than the breaking capacity of the fuse plus mcb's in your...
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