High Ze causing headache !

[sythai]

Hi Guys

Any advice/ pointers would be appreciated

Have ‘pretty big’ new build house we’re wiring from scratch.

New supply in from DNO is PME, but we have Ze of 0.51

Are DNO obliged to keep this under 0.35?

Wouldn’t be that much of an issue normally if regular size house and meter was attached to house.

Before we came along on the scene Client had separate garage block built, meter permanently sited in here.

We’ve run a SWA sub-main across to house DB 25metres away, but struggling on suitable overcurrent protection. Even at 80amps BS 88…. Max EFLI 0.40!

Don’t really want to be putting new build on TT system, if it comes to it.

Thank you
Sy

 

[sythai]

That what I said earlier confume with them before you do any thing else, before you take another route.

They have been out when I raised this previously (I wasn't there, Client only) and this was also before had all the help fully info above.

Hopefully I may have a case now if I can use the ESQCR limits

 

[timhoward]

.... assuming DNO have to comply with ESQCR? (not something I'm familiar with being honest)

They do. Here's the bit you need:

The Electricity Safety, Quality and Continuity Regulations 2002

These Regulations replace the Electricity Supply Regulations 1988 (S.I. 1988/1057) and all subsequent amendments (S.I. 1990/390, S.I. 1992/2961, S.I. 1994/533, S.I. 1994/3021 and S.I. 1998/2971).

www.legislation.gov.uk

 

[sythai]

They do. Here's the bit you need:

View attachment 94493

The Electricity Safety, Quality and Continuity Regulations 2002

These Regulations replace the Electricity Supply Regulations 1988 (S.I. 1988/1057) and all subsequent amendments (S.I. 1990/390, S.I. 1992/2961, S.I. 1994/533, S.I. 1994/3021 and S.I. 1998/2971).

www.legislation.gov.uk

Cheers Tim..... you Guys really are good on here