Anyone know how to get ZE from Scottish Power ???

I would think they will just give you the standard figures for PME or whatever you have if you aren't able to measure it yourself.

Gary

Agree.

If you want them to come and  measure it for you, and there  is no fault, they will charge, and considerably more than a normal sparks. 

If you want them to read you the book value over the phone it will be “less than 0.3 ohms ” for PME or “less than 0.8 ohms ” for TNS or ‘" it’s up to you" if you have TT.

Note that that “less than 0.8 ohms” will probably co-exist with a PSSC of ‘up to 16kA’  as far as the book is concerned, while in reality there will be a lower PSCC where the cable resistances are higher.

Mike.

Quote ESQCR 2002:

Information to be provided on request

28.  A distributor shall provide, in respect of any existing or proposed consumer’s installation which is connected or is to be connected to his network, to any person who can show a reasonable cause for requiring the information, a written statement of—

(a)the maximum prospective short circuit current at the supply terminals;

(b)for low voltage connections, the maximum earth loop impedance of the earth fault path outside the installation;

(c)the type and rating of the distributor’s protective device or devices nearest to the supply terminals;

(d)the type of earthing system applicable to the connection; and

(e)the information specified in regulation 27(1),

which apply, or will apply, to that installation.

yep, that is the book values, which are all ‘less than this greater than that’ not a reading.

Mike.

Are Scottish Power your supplier or your distributor?

Normally the supplier (they people you pay for electricity) can tell you about tariffs etc but know little to nothing about the wiring before the meter - for that you'd have to ask your distributor (DNO) -  i.e. whoever holds the local monopoly for the cables that come into your premises.

   - Andy.

Chris Pearson: 
 

Quote ESQCR 2002:

Information to be provided on request

28.  A distributor shall provide, in respect of any existing or proposed consumer’s installation which is connected or is to be connected to his network, to any person who can show a reasonable cause for requiring the information, a written statement of—

(a)the maximum prospective short circuit current at the supply terminals;

(b)for low voltage connections, the maximum earth loop impedance of the earth fault path outside the installation;

 

the words I have highlighted in bold, are why Mike was saying “< 16 kA” and “< 0.35 ohms” (if it's normal PME) and “< 0.8 ohms” if TN-S. They only have to tell you the maximum not the actual … In fact, the actual values can change, and that gets more likely with embedded generation!

Many thanks to everyone for the replies.

I have been told or DNO is Scottish Power, but everytime I contact them I just get the run around…   

What would be useful would be either a contact No. or email for who does this for the DNO' 

They don’t know what it is, they will just make an educated guess of what the maximum is.

Why do you need to know?

The DNO you can deduce  either from the MPAN (long number) on your bills or meters

Or from the post code via the ENA lookup. Don't get confused by transmission operators - they are the pylon people, you need distribution operators, 33kV and less.

https://www.energynetworks.org/operating-the-networks/whos-my-network-operator

Merseyside, Cheshire, North Wales & North Shropshire Telephone: 0330 10 10 280

Central & Southern Scotland Telephone: 0330 10 10 260

Alternatively, this page from EDF has a list of MPAN prefixes and DNOs, and then some contact info for the DNOs. 

 I have no idea who you get to talk to if you phone the no they give for SP networks - I'm at the other end of the country;-)  

https://www.edfenergy.com/large-business/customers/dno-distribution-network-operators

However, you can be sure nobody has specifically measured your site unless there has been a fault, and so they can only give you the book values based on transformer sizes and/or fuse ratings. Certainly SSE only give very wide limiting values.

mike.

OK, time for a wee fib. Call them and say that you have measured Ze above the maximum permitted. When I did this (almost 1 ohm on TN-S) they were round like a shot.