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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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    Sparkingchip:

    or just fit the consumer unit that the electrical wholesaler has on a special offer with SPDs preinstalled by the manufacturer?


    Andy B




    And don't forget to advise the customer to get any copper cable TV and phone/broadband lines surge protected, because it's little use doing the "mains" without these also being protected - as BS 7671 advises, see BS 6701 and BS EN 50174-3.

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  • 0

    Sparkingchip:

    or just fit the consumer unit that the electrical wholesaler has on a special offer with SPDs preinstalled by the manufacturer?


    Andy B




    And don't forget to advise the customer to get any copper cable TV and phone/broadband lines surge protected, because it's little use doing the "mains" without these also being protected - as BS 7671 advises, see BS 6701 and BS EN 50174-3.

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