Rear entry three phase board

[Toneyz]

?
The supply company feeds a meter, then it goes to the 1st board which feeds 4 sub boards, there is a meter before each sub board. The 4 sub boards are protected by 63A 3 pole CB's I said RCBO by mistake.

Usually, you would have an MCCB board with meters in the outgoing all in the landlord's cupboard.

 

[Gigsy]

Usually, you would have an MCCB board with meters in the outgoing all in the landlord's cupboard.

I didn't design that installation. Thank you for the heads up tho

 

[Toneyz]

Are all the outgoing circuit RCBO protected?

 

[Gigsy]

This is the main board, it feeds 4 sub boards

 

[Gigsy]

This is the main board, it feeds 4 sub boards

 

[Gigsy]

Are all the outgoing circuit RCBO protected?

All the circuits from the board i installed will be RCBO protected

 

[Toneyz]

Are all the outgoing circuit RCBO protected?

All the circuits from the board i installed will be RCBO protected

I would of done as Adam posted with the incoming SWA if you have to have that meter at that position would have been a trunking down the RHS SWA made off at top end cap then T off like you have done for the meter.

 

[Gigsy]

Usually, you would have an MCCB board with meters in the outgoing all in the landlord's cupboard.

An MCCB is not needed as the design current is not greater than 63A per phase.

 

[Gigsy]

Are all the outgoing circuit RCBO protected?

I would of done as Adam posted with the incoming SWA if you have to have that meter at that position would have been a trunking down the RHS SWA made off at top end cap then T off like you have done for the meter.

You would have made off the SWA to the end cap of the trunking?

 

[Toneyz]

How would a MCCB prevent such an event?

If there is a fault on one of the final circuits you would want the MCB to trip faster than the MCCB. A practical example of this I recall was one of the final circuits we installed the chippy put a nail through the cable now as we had a low ELI it took out the RCBO as well as the existing 50A MCB protecting this D.B. bad discrimination ( sorry selectivity new word)

 

[Gigsy]

If there is a fault on one of the final circuits you would want the MCB to trip faster than the MCCB. A practical example of this I recall was one of the final circuits we installed the chippy put a nail through the cable now as we had a low ELI it took out the RCBO as well as the existing 50A MCB protecting this D.B. bad discrimination ( sorry selectivity new word)

Trip faster? Does the MCCB not have to trip within 0.4s ?

 

[Gigsy]

I thought an MCCB was the same as a MCB (actrually CB not MCB as everyone calls them) only for higher Amps, over 63A

 

[Toneyz]

Trip faster? Does the MCCB not have to trip within 0.4s ?

Sorry, disconnect, 5 sec for distribution circuit.

 

[Gigsy]

If there is a fault on one of the final circuits you would want the MCB to trip faster than the MCCB. A practical example of this I recall was one of the final circuits we installed the chippy put a nail through the cable now as we had a low ELI it took out the RCBO as well as the existing 50A MCB protecting this D.B. bad discrimination ( sorry selectivity new word)

In that situation you would wanna substitute the 50A MCB for a type C or type D MCB?

 

[Toneyz]

I thought an MCCB was the same as a MCB (actrually CB not MCB as everyone calls them) only for higher Amps, over 63A

 

[Toneyz]

No start at 16A.

 

[Gigsy]

Sorry, disconnect, 5 sec for distribution circuit.

0.4 sec under 32A and 5 sec over 32A
In the situation you describe surly a 50A type c or type D MCB would be the solution?

 

[Gigsy]

SO what exactly is the difference between a 16A MCB and a 16A MCCB

 

[Deleted member 26818]

All distribution circuits and any final circuits greater than 32A have a maximum disconnection of 5s.
Or has that changed recently?

 

[ipf]

0.4 sec under 32A and 5 sec over 32A
In the situation you describe surly a 50A type c or type D MCB would be the solution?

There's a small matter of short circuit capacity rating involved, here, mate.