Discuss Cable calculation in the Commercial Electrical Advice area at ElectriciansForums.net

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If you do not know the design current then you are looking at worst case so that will push costs up. Are you not installing the final circuits?
Yeah however he may be adding at later dates i know all the lighgs will be led tho and its literally gonna be 13 amp sockets, so in terms of circuits, 4 lighying and 2 or 3 radials maybe, the circuits again will be a good run in armoured so il also be cable calculating these but this wont be a problem as i will have design current as and when the cistomer knows what hes having in. Just this main cable with the run like
 
Fare enough mate. Hard to do cable calcs without it though.
If this is an actual job then don't you need to have a fused insolator fitted? Won't the insolator fuse be lower than 80A?
Please correct me if I'm wrong in this.
Yeah im now thinking degrade the fuse rating in my isolator, going off topic how do this work in domestic when the heas is a 60amp but the mainswitch on a db is 100amp
 
What’s you design load and max demand? Earthing arrangement? Any utilities that require bonding?
I dont have one as the customer doesnt exactly know what he is having, i was going with the worst case being the fuse rating on the main head. No utilities as its pvc water main. And main earth will be tt as its in a field, western power have put a tncs in but we will be putting a earth rod in along with rcd ect ect
 
Yeah however he may be adding at later dates i know all the lighgs will be led tho and its literally gonna be 13 amp sockets, so in terms of circuits, 4 lighying and 2 or 3 radials maybe, the circuits again will be a good run in armoured so il also be cable calculating these but this wont be a problem as i will have design current as and when the cistomer knows what hes having in. Just this main cable with the run like

I would design to 63A if this was me.
 
I dont have one as the customer doesnt exactly know what he is having, i was going with the worst case being the fuse rating on the main head. No utilities as its pvc water main. And main earth will be tt as its in a field, western power have put a tncs in but we will be putting a earth rod in along with rcd ect ect

How comes you are not using the TN-C-S?
 
No but in terms of over current in a domestic dwelling ive seen a db have 100amp main switchbwith and the main head bein 60amp fuse, the fuse in the main head would blow before rhe main switch would trip. Which is incorrect but why is this done.

I think this is the clincher. Get someone competent on this job mate.
 

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