PSCC on 460V Split Phase Supply

Hi all.

Been doing a bit of work on a pub out in the sticks with a 460V split phase Supply. When tried to test phase - phase PSCC my tester didn't play along. I was going to use the double p - n rule of thumb but then I got thinking, does this still apply to a 460v supply?
 
It's a TNCS single phase 3 wire supply.

My test kit is good for 3 phase, has phase rotation built in. Its a 3 lead tester and tests loop impedance and pfc in one go but it only gave me the impedance readings on p - p.

I guess it is not compatible with 460V :confused:
 
Its a pretty unusual supply system but they use to use it where they had no 3 phase HV. Winding are tapped at 180 not 120 so 2 phases at 460v.
Split_phase2.png
 
The sub stations from center point would show 415 , from their to a farm or a commercal buildings and from thier to motors so how could the building you at testing on come up 460v ,you better ring the DNO to clarify what voltage you have got .
 
Last edited:
Where do you get 415V from? 415 is the old 3 phase standard, this is not 3 phase.

Google 'single phase 3 wire' if you really don't believe me. The phase - phase voltage is 460v, there is nothing wrong with this and while it is unusual it is perfectly acceptable.

I'm just wondering on how to calculate the PSCC, the supply arrangement is a non issue.
 
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Created
Blissof89,
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brianmoooore,
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