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Topic Title: "Meter mans chart" - Chart that installers of larger supplies check for cable sizes
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Created On: 09 August 2010 09:37 AM
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 09 August 2010 09:37 AM
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Alexg

Posts: 408
Joined: 03 February 2004

Guys,

Apparantly there is a chart that meter installers of larger supplies use to check what fuses they can install with certain sizes of meter tails.

Can anyone provide this chart for me ? - I think BOD has a copy?

Regards,
Alex.
 09 August 2010 02:58 PM
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Alexg

Posts: 408
Joined: 03 February 2004

If the chart isn't available, can someone tell me if they accept 95mm2 (1.5m run) inside 6x6 trunking with 50mm main earth & 25mm bonding.

Thanks.
 09 August 2010 05:03 PM
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pmenetwork

Posts: 353
Joined: 20 September 2009

You are correct in your sizing, assuming you are talking about
240 amps/phase fusing.
Bare in mind that this size of 3phase supply reqs an external loop impedance of 0.20ohms, or less.
Any further info please ask, and I will calculate it for you.
By the way I know of no Meter mans chart, perhaps some of the others have one, but this calculation is correct.
 09 August 2010 05:04 PM
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slittle

Posts: 3595
Joined: 22 November 2007

Alex,

I've got one, PM me your email address.

My copy is the siemens version, but I think they are all the same.

Stu
 09 August 2010 05:28 PM
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Alexg

Posts: 408
Joined: 03 February 2004

Originally posted by: pmenetwork You are correct in your sizing, assuming you are talking about 240 amps/phase fusing. Bare in mind that this size of 3phase supply reqs an external loop impedance of 0.20ohms, or less. Any further info please ask, and I will calculate it for you. By the way I know of no Meter mans chart, perhaps some of the others have one, but this calculation is correct.
Many thanks for the reply, I forgot to state the fuse rating - 200A P/Ph I would take it the DNO would ensure the EFLI was <0.20 ohms? Am I correct in sizing 25mm equipotential bonding?

Edited: 09 August 2010 at 05:49 PM by Alexg
 09 August 2010 05:46 PM
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pmenetwork

Posts: 353
Joined: 20 September 2009

If it is a 200amp/phase load 70mm, rather than 95mm will do.
as regards bonding, its still 25mm.
However, as you have now dropped a size to 70mm,
35mm earthing lead willdo,mechanically protected, trunking to CT box.
course, if youve already the cable......................! sorry!
 09 August 2010 05:49 PM
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Alexg

Posts: 408
Joined: 03 February 2004

Many thanks PME.

I think I did originally spec 70mm but was then told this "meter mans chart" stated it had to be 95mm in order for them to connect...
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