- Reaction score
- 3,010
Those week I have mostly been fitting 20 x 10W flood lights on the sloping edge of a converted mill ceiling, nothing is straight, nothing level.
The supply to the lock up unit has just been supplied by the landlord along with a new DB with two circuits (lights & sockets)
This is the second lot of work I've done here, in both cases the landlord supplied the board and supply new.
The agreement with the landlord is any works we do is tested and our incomplete certificate is amended to the new supply certification to form a complete certificate.
This means that all source, bonding and submain OCPD details are unavailable to me, in fact they are inaccessible.
I have a ZDB of 0.31 ohms, which is fine for my needs, no 32A D types going in, just a 20A socket radial and 2 x C10s for lights.
However...I just couldn't help myself and got the wonder lead out.
The building is the old pillar and beam construction. Cast iron pillars with steel beams atop.
All the pillars gave something between 5 and 10 KOhms resistance to the incoming earth of the submain, the armour of a 10mm 4 core SWA.
There was a roller shutter door, somehow fixed to the steel beam, which gave 1KOm.
And finally, whilst there is no gas or water, there is a small section of copper pipe that transits the corner of the room @ 1KOhm,
So, all extraneous.
My observations will be noted on my part of the certificate but I doubt the LL will do anything about the bonding.
The mill is about 150m square, subdivided into many units of varying sizes.
Me bonding to the DB doesn't seem right as effectively all the steel is joined together and therefore all the steel will be bonded via this submain.
Am I right in thinking this should be bonded from the MET in something sized to the incoming line conductors.
The supply to the lock up unit has just been supplied by the landlord along with a new DB with two circuits (lights & sockets)
This is the second lot of work I've done here, in both cases the landlord supplied the board and supply new.
The agreement with the landlord is any works we do is tested and our incomplete certificate is amended to the new supply certification to form a complete certificate.
This means that all source, bonding and submain OCPD details are unavailable to me, in fact they are inaccessible.
I have a ZDB of 0.31 ohms, which is fine for my needs, no 32A D types going in, just a 20A socket radial and 2 x C10s for lights.
However...I just couldn't help myself and got the wonder lead out.
The building is the old pillar and beam construction. Cast iron pillars with steel beams atop.
All the pillars gave something between 5 and 10 KOhms resistance to the incoming earth of the submain, the armour of a 10mm 4 core SWA.
There was a roller shutter door, somehow fixed to the steel beam, which gave 1KOm.
And finally, whilst there is no gas or water, there is a small section of copper pipe that transits the corner of the room @ 1KOhm,
So, all extraneous.
My observations will be noted on my part of the certificate but I doubt the LL will do anything about the bonding.
The mill is about 150m square, subdivided into many units of varying sizes.
Me bonding to the DB doesn't seem right as effectively all the steel is joined together and therefore all the steel will be bonded via this submain.
Am I right in thinking this should be bonded from the MET in something sized to the incoming line conductors.