"...address 1:
LV underground - 362m
HV underground to primary- 2000m
No Surge protection devices
For addr1, ignore the HV (e.g. use zero for Lpah Lpch), then take Lpcl as 362 and Lpal as 638 ?
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. ..."
Sparkingchip:
or just fit the consumer unit that the electrical wholesaler has on a special offer with SPDs preinstalled by the manufacturer?
Andy B
psychicwarrior:
Interesting re: the phone line concerns - perhaps all one can do, given it belongs to the phone company up to the master socket and is not BS7671, is advise the client that it too needs looking at and to contact the supplier to have it assessed - or can someone fit something themselves without messing with the master socket - will have to have a read. Then there is fibre (dependng on construction materials) to consider...Or is it really immune as one might think.
Thank you all again.
Zoomup:
The official advice ........
http://phonefault.com/lightning-damage/
Z.
gkenyon:
psychicwarrior:
Interesting re: the phone line concerns - perhaps all one can do, given it belongs to the phone company up to the master socket and is not BS7671, is advise the client that it too needs looking at and to contact the supplier to have it assessed - or can someone fit something themselves without messing with the master socket - will have to have a read. Then there is fibre (dependng on construction materials) to consider...Or is it really immune as one might think.
Thank you all again.The requirement in BS 50174-3 (referred to from BS 6701 and BS 7671) is to fit SPDs "at all building entrances if the IT cable contains metallic cable elements, and where inadequate protective measures have been provided in the external IT network".
...
We're about to take you to the IET registration website. Don't worry though, you'll be sent straight back to the community after completing the registration.
Continue to the IET registration site