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equation

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  1. N

    Adiabatic equation question

    Hi Guys my question is with relation to the adiabatic equation, I am aware that the following is true. S = Size of earth bonding conductor required. I = pfc in amps. t = disconnection time in seconds. K = values in table 43.1. If I am trying to work out if a 6mm gas and water bond is...
  2. carl9254

    Building Control

    Hello, got my Elecsa assessment on 4th january, going to change the cu in my house and use that as assessment job, its simple as only 3 circuits, sockets, lights and shower. But shall i tell building control?? Elecsa said upto me, they dont request it but they will let building control know...
  3. M

    adeabatic equation

    Have been told i shud do a adeabatic for all the circuits i put in When i have a hi pfc they dont pass allthe time I take pfc at point served (or calculate from V divided by Zs) then i times it by itself then i times it by disconection time (0.1 for type b) then find the square root of that...
  4. D

    Adiabatic Equation

    Hello Does anybody know if 'I' in the equation relates to PSCC or PEFC. GN3 seems to point to PEFC, but reg 543.1.3 seems to suggest PSCC. Any ideas? Thanks
  5. S

    Adibatic equation for 6mm earth

    As a matter of intrest how is the calc worked out for working out whether a 6mm main bond on a Tns complies
  6. S

    Adiabatic equation

    Recent pir i did last week ring main 2.5mm and cpc 1mm so using the equation If =Uo/Zs=230/0.82=78673.183 so this is my fault current sq root of =15734 x time(type b32 amp)0.1s divided by 115 88.69/115=0.77 so 1mm is cool looking at app 3 pg 249 in bs7671 cannot seem to see the time...
  7. D

    Confirmation of earth size is correct, using adiabatic equation.

    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 a...
  8. D

    Adiabatic Equation

    Does anyone do the adiabatic equation to check earthing conductor size is okay, as we've just been taught it at college and its very good to know. My question is, do you actually check this in the field or just take it for granted? Thanks in advance for all responses.
  9. D

    Adiabatic Equation

    Hi All, Can anybody help....Trying to establish if I would have to change the mec on a TNS system.... Ok So S=sqr(I2xt)/k When establishing the value of 't' do I use the characteristics of the distibutors main fuse or the main switch in the CU or I have missed the point entirely?:rolleyes...

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