bit of guidance as suffering from empty head syndrome

[martin mcguinness]

I was asked to check electrical work in a mates garage, workshop, office,and valet bay. both the sub boards in the office area and valet area are fed from 40a mcbs to sub boards using 10mm t&e . Would i class the supplies as final circuits as fed from mcbs at the main dist board as trying to work out if cpc in t&e adequate to supply sub board. Am I overthinking this he has just purchased this building and it was rewired for previous owner and the install is decent and test readings all acceptable inc zs at sub board circuits. But I have this nagging in the back of my mind telling me the earth to the sub boards should be 10mm same as line and neutral.
As I said empty head or over thinking this
cheers

 

[Wilko]

Hi - Any bonding off the sub boards?

 

[martin mcguinness]

No just final circuits to sockets and lighting main bonding to water and gas ran from main dist board. Trying to remember where I am getting the earth conductor same size as line and neutral up to 16mm then half or greater above that

 

[Strima]

What does the adiabatic say?

 

[buzzlightyear]

what is supply from the DNO .

 

[martin mcguinness]

3 phase 100a

 

[buzzlightyear]

3 phase 100a

what bananas .

 

[westward10]

You are over thinking this

 

[buzzlightyear]

You are over thinking this

me has well, I will not sleep to night in case I have nightmares about the op work .

 

[martin mcguinness]

cheers westward
any ideas where I am getting the 10mm supply -10mm earth from
im nightshift tonight so will get head in reg book to see where I am getting this from

 

[buzzlightyear]

any ideas where I am getting the 10mm supply -10mm earth from
im nightshift tonight so will get head in reg book to see where I am getting this from

the sub mains are 10mm the fuse is 40amp the cpc in side the 10mm is 4mm so do the maths .what is the supply ?

 

[UKPN]

As westward 10 says, you are over thinking this. A PME bond of min 10mmsq is only reqd for main bonding. These are sub mains leading to final circuits with the main bonds separate. Sleep well!

 

[buzzlightyear]

As westward 10 says, you are over thinking this. A PME bond of min 10mmsq is only reqd for main bonding. These are sub mains leading to final circuits with the main bonds separate. Sleep wel

thanks .