KA

[sparks1234]

We all know about Ze / Ka readings when we write the ticket out.

Now, when we get to a 3-phase dis board, rule of theumb says we double the reading.

Thats fine but if you only have a single phase circuit coming from the dis board, do you still need to double it up

 

[Guest123]

If the supply to that DB is 3P then the PFC value at that DB will be need to be recorded as the doubled value.

 

[Sintra]

Yes if the supply to the single phase circuit is from a 3 phase DB then the pfc needs to be doubled.

 

[sparks1234]

OK.

We have a KA reading of about 4KA on the incomer and most of the circuit breakers are 6KA.

It is a Hager board, does anyone know if the RCBO's are available in 10 KA, I know the MCB's are but the board has the dis board version and they are 6KA.

A little pointer on the Hager RCBO units, they produce 2 different RCBO's. 1 for consumer units and 1 for dis boards, the difference is a longer neutral lead and earth lead, the biggest difference though is the price if you let them get away with it.

We pay £20 for consumer unit version and £24 for dis board version, they wanted nearly £50 for the dis board one though.

Whats everyone else paying, and why are all the other big makes so expensive?