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Risk assessment for spd,s in domestics.

hertzal123
Just checking my calcs for requirement for spd in a suburban area,fenv =85.Don,t know length of supply cable so Lp =1 and ng for my area

is 0.3,so using fenv/Lp x Ng gives a risk assessment figure of about 283,indicating a spd is required because its under 1000.So does this indicate

that most suburban domestic installations require spd,s?The suburb is only a mile from a town.Thanks for any replies.

                                                                                                    Regards,

                                                                                                               Hz
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    That's only if you assume the worst about the supply cable. Normally you'll have a rough idea whether the supply to the house is over/under ground, how far away the nearest substation is, whether the HV supply to that substation is over/underground and for that matter whether there appear to be any LV or HV poles/pylons anywhere near, via Google maps.
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    That's only if you assume the worst about the supply cable. Normally you'll have a rough idea whether the supply to the house is over/under ground, how far away the nearest substation is, whether the HV supply to that substation is over/underground and for that matter whether there appear to be any LV or HV poles/pylons anywhere near, via Google maps.
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