calculation

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  1. S

    3ph + E Zs calculation?

    Can anyone tell me how to calculate the zs in a 3ph+E installation as my tester will not give me a reading. I've looked into it and a special loop tester is needed, if this is right? Thanks Paul
  2. E

    Volt Drop Calculation

    Appendix 4 in the regs has tables for Current-Carrying Capacity and Voltage drop. I've used these many times with no problems, but i've never had to calculate a cable higher than 25mm. when you look at cables 25mm and higher you see three values for mV/A/m (r, x, & z). Using the calulation...
  3. A

    formula and calculation aid section

    Wondered if it would be of use to have a formula and calculation aid section, ie fill in the blanks and get the answeer type thing. :) Dont know how difficult it would be to do :o Any opinions?
  4. S

    length of circuit calculation - head scratching stuff!

    Hi all, How do I work out the length of a circuit? I have these figures R1+R2 = 0.40 The circuit is wired in 2.5mm/1.5mm T&E I take it I need to know the resistance of the T&E (where do I find this?) Could someone give me the formula or point me in the right direction Thank you.
  5. D

    Adiabatic calculation confirmation

    Could anyone just confirm my results for adiquate earthing size and calculation using the adiabatic equation... My test was on a ring main circuit wired in 2.5/1.5 pvc.. My supply voltage is 247v My Impedance is 0.38 ohms. The circuit is supplied via a RCBO 32a C type My results suggest that...
  6. R

    Calculation of ZS

    Evening guys When calculting ZS u us the formula ze + r1 + r2 So i have 0.18+0.60+1.00 = 1.78 But i also have my r1+r2 result which is 0.40 0.18+0.40 = 0.58 so which 1 do i use then? Cheers guys. :)

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