2365 Level 3 Design Project. Volt Drop feed to Summer House and earthing

[Gurnatronics]

Afternoon Gents, just a query regarding volt drop and extending the equipotential zone on a PME in the level 3 design project.

In my design I used a 16mm armoured and the associated volt drop was 5v, this left 1.9 volts for the lighting ring in the summer house. Tutor said not to worry about the feeds volt drop as it was not cumulative and wouldn't effect the lighting circuit. Is this correct, or just leaving it out for sake of simplicity.

Also, if I were to use a 16mm feed, would that also allow the PME to export its earth? The summer house has sinks and toilets so I assume will have copper piping to underground. I can recall seeing a 10mm bond would mitigate the risk but cannot find the appropriate reg with regards to out-buildings. Would a TT earth stake be a better solution?

Thanks for looking this over and look forward to your inputs!

 

[lee75hunt]

Hi all, Im just starting my design assignment, my query is are we supposed to do all cable calcs for the summerhouse aswell as there is no mention in the question paper about it, only pool and cafe. thx for the help in advance

 

[Strima]

Hi all, Im just starting my design assignment, my query is are we supposed to do all cable calcs for the summerhouse aswell as there is no mention in the question paper about it, only pool and cafe. thx for the help in advance

If there are circuits in the summer house then you will need to design them, so yes, you will need to do the calcs.

TBH once you get into the flow you'll be surprised how quick you can do them.