Volt drop

[ImpededLoop]

sorry but your calc is flawed.

firstly extend the ring with fcu for lighting, you wont hit 100m total length for ring.

you should only have the lighting off the fcu


cheating method is zs on socket you are going to extend the ring from to see if zs is low enough, extend then test properly

I don't think the OP's intended method is incorrect. He's quite rightly trying to design his circuit first to check it will comply with 7671.

 

[Maxstone89]

18x26x66%1000=30.888 volt drop for a ring circuit, ??

mV x amp x meters%1000 is my calc have i missed something here?? As obviously its not right

 

[Maxstone89]

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[Maxstone89]

I know a ring main dosnt need calc if a new installation as long as it served no more than 100sqm but if your calc it for a fcu of 13amp for a radial circuit for 1.5mm for 12m how would you calc it to add to the calc for the spur, as obviosly this is above 11.5v drop?