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At a property today I found that several lights have been taken as a spur of a ring main. At the end of the spur I get 1.33 Zs which is too high as it's on a 32A B MCB and should be lower than 1.16.

If I convert this to a fused 3A spur with FCU, can I used the 3A fuse to calculate the max Zs allowed? (which would be OK if so)
 
Yes that would be ok.
 
your Zs would be for the circuit from the fcu to last light and if a 3amp fuse is ok load wise then thats what you should use
 

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