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my surge protection 'cpd', such as it is...

psychicwarrior
Good morning all


I have obtained the following [I feel as the] 'best we can do for now' information from the DNO. They were helpful in my test case request for info.


"...address 1:

LV underground - 362m

HV underground to primary-  2000m

No Surge protection devices


address 2:

LV underground to substation - 110 m

HV UG from substation to HV pole is 823m then 301m 11kV overhead then 190m HV UG to the primary substation.

Distance to cable termination with surge protection device from secondary substation is 1124m (823m 11kV UG + 301m 11kV Overhead).  The nearest cable

termination does not have surge protection installed. ..."


In relation to the risk assessment equation variables dealing with distribution cable lengths  ie. the Lpal Lpcl Lpah Lpch, how would one fit the given values into the variables ?


For addr1, ignore the HV (e.g. use zero for Lpah Lpch),  then take Lpcl as 362 and Lpal as 638 ?


For addr2, i'm not sure on this one ?


Thanks for your input.

Habs


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  • 0
    My phone line was installed in the 1960’s back in the days when you had a big battery at the house and the phone line was earthed.


    The earth electrode is still in place, but the BT guy that replaced the line box disconnected the earth conductor then the guys who installed my uPVC porch frame took it upon themselves to rip the part of the earth conductor that went through the old softwood porch frame out with it completing the disconnection.


    Andy B.

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  • 0
    My phone line was installed in the 1960’s back in the days when you had a big battery at the house and the phone line was earthed.


    The earth electrode is still in place, but the BT guy that replaced the line box disconnected the earth conductor then the guys who installed my uPVC porch frame took it upon themselves to rip the part of the earth conductor that went through the old softwood porch frame out with it completing the disconnection.


    Andy B.

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