DB installed connected & tested

[cliffed]

Just your thoughts on this DB,it’s a Lewden type,I personally don’t like them.
Bus bar,not ideal,main switch on right,space very tight to make connections,hate the rcbo’s,screws in front of each other,making it hard to retighten .

 

[cliffed]

Don’t you think the bus bar system ,a bit dated,rather have the plug & play,like Schneider.

 

[Leesparkykent]

I didn't notice the upfront RCD, that's going to be a PITA for the customer in the event of a fault.

 

[suffolkspark]

@Leesparkykent its a time delayed one so "should" be ok, you can just see the S on the front of it.... The rcbos are only single pole though so there still isnt perfect discrimination and a fault remaining on the neutral will trip the whole supply... Not a great setup imo...

 

[Leesparkykent]

@Leesparkykent its a time delayed one so "should" be ok, you can just see the S on the front of it.... The rcbos are only single pole though so there still isnt perfect discrimination and a fault remaining on the neutral will trip the whole supply... Not a great setup imo...

Yes that was exactly my point. Neutral earth fault and the RCBO will trip but the upfront RCD, time delayed or not will still trip as the RCBO's don't break the neutral.

 

[cliffed]

Good point,they are usually supplied with earths,to solve that problem

 

[cliffed]

@Leesparkykent its a time delayed one so "should" be ok, you can just see the S on the front of it.... The rcbos are only single pole though so there still isnt perfect discrimination and a fault remaining on the neutral will trip the whole supply... Not a great setup imo...

Agree,could be a problem there

 

[MFS Electrical]

My issue with the Lewden boards is the advised torque settings, I have two torque drivers and with either if I torque them to manufacturers settings it has a tendency to damage the rcbo screws.

Do you have the pozi-flat hybrid type driver in your torque set? I do and have never had an issue with the Lewden RCBOs

 

[Deleted member 26818]

Think I would have kept the main switch and installed a 63A RCBO, rather than swapping the main switch for an RCD and using a 63A MCB.

 

[cliffed]

Yea,the problem is that the 63 amp breaker supplies a Loxone lighting panel,Rcbos in that Panel serves lighting .
So that was the purpose for the 100 ma td Rcd,discrimination for the other rcbos.

 

[suffolkspark]

Trouble is unless they are double pole rcbos then you have provided no discrimination.....

 

[Andy78]

How is fault protection provided for the 63A circuit ?

 

[suffolkspark]

How is fault protection provided for the 63A circuit ?

By the upfront rcd....

 

[Andy78]

By the upfront rcd....

I thought it was time delayed ? How will this meet disconnection times ?
Bear with me as I have nothing to do with TT systems and probably lack a lot of knowledge in this area.

 

[Wilko]

I thought it was time delayed ? How will this meet disconnection times ?
Bear with me as I have nothing to do with TT systems and probably lack a lot of knowledge in this area.

Hi - TT disconnection times for a distribution circuit is up to 1 second from Reg 411.3.2.4

 

[Andy78]

Hi - TT disconnection times for a distribution circuit is up to 1 second from Reg 411.3.2.4

Cheers for that. Thought I would be missing something. Didn't think the higher times applied to TT.
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