19.1ka psc reading on a 2 bed small house!

[ch1cki]

Any ideas??

 

[ch1cki]

Mcb's only 6ka

 

[johnboy6083]

close to substation or transformer?

 

[High Tower]

Are you sur you are not sat IN the trans/sub with a reading like that?

 

[ch1cki]

Earth Rod me up!!

 

[ch1cki]

Haha, its about 15ft from the house mind

 

[johnboy6083]

there you go mate. your cutout should have a high enough breaking capacity to cover this, but double check that you aint got a 3036 ect.
i think the one you need is a 1361-2 or a bs88

 

[Guest 004]

take the neutrals to the switches first, that should get your readings down

 

[ch1cki]

1361 type 2 has plenty, 33ka. But where does that leave the mcb's? confused abit?

 

[pushrod]

there you go mate. your cutout should have a high enough breaking capacity to cover this, but double check that you aint got a 3036 ect.
i think the one you need is a 1361-2 or a bs88

Think these are only good to 16kA PFC and that is with a CU enclosure to BS EN 60439-3

Edit: bit of a cop out but instead of using your measured value you could phone up the supplier and get them to quote you a value.

 

[High Tower]

1361 type 2 has plenty, 33ka. But where does that leave the mcb's? confused abit?

Fault current of that size would take the service fuse out first so the MCB's shouldnt be touched

 

[Engineer54]

Depends on the ''let through energy'' of the type of BS 1361. But generally most 1361 fuses will limit the let through energy to below 6KA in the majority of cases in domestic situations....

 

[ch1cki]

how do they do that? And whats the point in putting a ka rating on the mcb then?
Electrics ***** ME OFF.

 

[ch1cki]

TYPE 1 are good to 16KA

 

[pushrod]

TYPE 1 are good to 16KA

you were talking about fault currents - have a read of page 56, bottom paragraph, of the OSG.

Or post #10