Voltage drop and ZS - Some thoughts

[Silly Sausage]

Pedantic I know...!

BS1362 fuse.
Zs @ 0.4s, 3A = 16.4, 13A = 2.42 ohms.

 

[Guitarist]

Pedantic I know...!

BS1362 fuse.
Zs @ 0.4s, 3A = 16.4, 13A = 2.42 ohms.

Where are those figures from Archy?

 

[pencilpusher]

Where are those figures from Archy?

I have seen these in the BGB with the other max ZS values.

 

[Silly Sausage]

Found them here...
http://www.shepleyelectricalservices.com/Max ZS Table.pdf

edit...

John, below, has just pointed out where they are in the Big Book!


I shouldn't have changed my picture earlier!

 

[johnboy6083]

sory archy, i meant 1362,.

Those figures are from table 41.2.

 

[johnboy6083]

Found them here...
http://www.shepleyelectricalservices.com/Max%20ZS%20Table.pdf

BRB only gives 5sec Z esses for 1362s.

if you look on the page beofre mate, they are there at the bottom.

Im having to look them now for an EICR im writing up

 

[pencilpusher]

Yep Table 41.2 BGB Page 55 gives 0.4 times for BS 1362 fuses.

 

[Guitarist]

Haha. Ty guys. Just looked in my BGB and I've even highlighted that table. I must be getting old...

 

[GaryM]

Look upon the supply to the FCU as a distribution circuit with protection from a B32A MCB and the final circuit from the FCU with protection from a BS1362 fuse.
You could add a second schedule of test results just for the final circuit from the FCU, treating the FCU as a distribution point.

Volt drop is measured from the origin of the installation.

 

[pencilpusher]

Look upon the supply to the FCU as a distribution circuit with protection from a B32A MCB and the final circuit from the FCU with protection from a BS1362 fuse.
You could add a second schedule of test results just for the final circuit from the FCU, treating the FCU as a distribution point.

Volt drop is measured from the origin of the installation.

Yes understood but a minor works would also meet the regs because it is not "a new circuit" in itself. Horses for courses I suppose!