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Sorry Iam yrying to work out K factor for a consumer mains & sub mains CM 300mm SM 50mm K factor as per AS/NZ 3008 for 300mm V75 = 111 I have worked out ( with a little help ) S = Sqrt of Isq X T/Ksq CM = 7143X7143X2/111X111 = 91mm SM = 5523X5523X1/111X111 = 49.75 mm Iam trying to...

Ok fellas thanks for the replys before, but can you check/help with this. t = Ksq X Ssq/Isq ????? t = 111 X 111 X 300 X 300/7143 X 7143 = 21.80 sec S = 300mm consumer mains t = 111 X 111 X 50 X 50/5523 X 5523 = 1.08 sec Is this correct or near ???? t = the time it will take before the...

Morning all, ant one care to explain/help with this ???? S= current sq x t K sq Current is it fault/design ??? Fault current sq ( 7137 x 2) X 2 secs ( 111x2 ) = 14274/222 = 64.29 mm

Thanks Kerching, do you mind if I fly you via Thailand for a 2 week stop over 1st ????.

Thanks Steptoe, Z at the submain/PA or both added toghether ?? If I have impedences of, Z1 transformer imp 0.01591 Z2 Consumer mains 0.0037 3 Z3 submains to DB 0.026 I think AMP=Z1+Z2+Z3/ is it sph or 3ph after this I loose the will to live !!!!!.

Ta for that, my question is how I work it out. Uo/ ???? or ?????. I just can`t seem to figure it out I know I appear thick but I just cannt get it.

Thanks Steptoe, but I was after the for formula !!! I just can`t seem to get it in my head for some reason !!!!!. :coat :coat:coat:coat:coat:coat:coat:coat:coat

Hi Iam a mature apprentice in Western Australia and Iam struggling with PFC & PSC can any one help me pls, I have been told by a guy from the UK this is the site to be on. Regards Downundersparky.