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I am pricing a job to wire 21 new pitches for a caravan park. There will be a meter box beside each caravan with a 16a trip. I will split it into the 3 phases, so 7 caravans per phase.

Im just trying to figure out how to calculate the cable size. Is it better to run a ring main to pick up 7 caravans? If so how do I do a cable size calculation for ring main?

Cheers
 
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TJ Anderson

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Read Section 708 of the regs. There is specific requirements for this.

Your Ib won't be as high as you think
 

telectrix

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a 10.0mm SWA radial for 7 pitches will be adequate . probably even a 6.0mm, considering diversity.
 

davesparks

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You could do anything from installing a feeder pillar centrally with a seperate radial to each pitch up to running a large 3 phase cable with a Y joint to tap off a phase for each pitch.

The physical layout of the site and distances involved may have an influence on what the most economical way is.
 
It is something we have done on a few occasions best way is each on there own feed
Fed via a dp 100ma time delay rcd for each circuit
 
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