E.L.V. Garden Bollards.

522.8.10 is obviously aimed at L.V. not E.L.V. The use of the expression "suitable for use as a protective conductor" is a give away..

I don't think that adds up - you can have protective conductors on ELV - both FELV and PELV - and LV systems without protective conductors are possible too - e.g. separated systems for single items of equipment and fully double/reinforced insulation (a c.p.c. has to be included for the latter in domestic and similar uncontrolled installations of course, but as a general principle it's not required).


Given the wording and position of 522.8.10 I don't think it can avoided as reading that it should be applied to all systems - if it was intended as applying onto the ADS systems only then section 411 would have been a more obvious location for it for example. Some might think that many of the other provisions (depth, marking tape and so on) would be sensible for any system. I guess they're expecting us to use the conduit/duct option where there isn't a c.p.c. The near-by regulations for cables concealed in walls have an explicit get-out for SELV & PELV circuit - so clearly the 522 section in general is intended to be read as applying to ELV too.


A while ago in response to one of the DPCs I did suggest an exemption for SELV at least for the earthed sheath/armour bit (and I gather through the grapevine that it was discussed - so the committee are aware that it is being read as applying to SELV/PELV systems) but seem to have decided not to change it.


   - Andy.

522.8.10 is obviously aimed at L.V. not E.L.V. The use of the expression "suitable for use as a protective conductor" is a give away..

I don't think that adds up - you can have protective conductors on ELV - both FELV and PELV - and LV systems without protective conductors are possible too - e.g. separated systems for single items of equipment and fully double/reinforced insulation (a c.p.c. has to be included for the latter in domestic and similar uncontrolled installations of course, but as a general principle it's not required).


Given the wording and position of 522.8.10 I don't think it can avoided as reading that it should be applied to all systems - if it was intended as applying onto the ADS systems only then section 411 would have been a more obvious location for it for example. Some might think that many of the other provisions (depth, marking tape and so on) would be sensible for any system. I guess they're expecting us to use the conduit/duct option where there isn't a c.p.c. The near-by regulations for cables concealed in walls have an explicit get-out for SELV & PELV circuit - so clearly the 522 section in general is intended to be read as applying to ELV too.


A while ago in response to one of the DPCs I did suggest an exemption for SELV at least for the earthed sheath/armour bit (and I gather through the grapevine that it was discussed - so the committee are aware that it is being read as applying to SELV/PELV systems) but seem to have decided not to change it.


   - Andy.