10mm meter tails 60amp fuse 6mm bond

[simpson93]

So the install is fine than

 

[davesparks]

So the install is fine than

Is it? What size earthing conductor is required?


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[Leesparkykent]

So the install is fine than

depending on the installation method of the tails and the PEFC of the installation.

 

[Leesparkykent]

what's the Ze?

 

[marconi]

Why do you say minimum 16mm tails and 10mm bonding?
The minimum size for bonding is 6mm unless PME conditions apply.
There is no lower limit on tail size, other than the availability factor.


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Do you not mean to say 'demand factor' or 'load factor'?

 

[simpson93]

0.3 ze

 

[Leesparkykent]

0.3 ze

V/Ze= 766A

I=766
T=0.16
K=143 (not incorporated in a cable or bunched)

766x766=586756

586756x0.16=93880

square root of 93880=306

306/143=2.13mm for your main earthing conductor.

Taking reg 544.1.1 in to account the 6mm bonding conductor is adequate.

Edit: Based on a BS1361 fuse

 

[Deleted member 26818]

A Ze of 0.3 Ohms suggests that PME conditions apply.

 

[davesparks]

Do you not mean to say 'demand factor' or 'load factor'?

No I mean to say availability factor, tails smaller than 16mm are not commonly available as a lot of wholesalers don't keep them.


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[marconi]

No I mean to say availability factor, tails smaller than 16mm are not commonly available as a lot of wholesalers don't keep them.

Thank you for clarifying. I thought you might have been using 'availability factor' as used to describe sources of electrical energy see https://energymag.net/technologies/availability-factor/

 

[JohnS888]

V/Ze= 766A

I=766
T=0.16
K=143 (not incorporated in a cable or bunched)

766x766=586756

586756x0.16=93880

square root of 93880=306

306/143=2.13mm for your main earthing conductor.

Taking reg 544.1.1 in to account the 6mm bonding conductor is adequate.

Edit: Based on a BS1361 fuse

Hi Lee or anybody else. Can you confirm what the T value of 0.16 relates to with this calculation?

Thanks

 

[JohnS888]

V/Ze= 766A

I=766
T=0.16
K=143 (not incorporated in a cable or bunched)

766x766=586756

586756x0.16=93880

square root of 93880=306

306/143=2.13mm for your main earthing conductor.

Taking reg 544.1.1 in to account the 6mm bonding conductor is adequate.

Edit: Based on a BS1361 fuse

Hi Lee or anybody else. Can you confirm what the T with value of 0.16 relates to here?

Thanks

 

[ronalsparks]

The supply authority and utility provider will expect to see 16mm tails and therefore a 10.0mm bond is required to satisfy their requirements also. The regs and calculations can determine other values but to ensure you meet the minimum requirements of the energy supplier this is what I would install as a contractor.