Filling in switch fuses on a certificate

[snipersmith87]

If a circuit has a switchfuse/isolator.....Do you record that on the cert as a seperate DB??? (Obviously as switch fuse)

 

[buzzlightyear]

what is it feeding .

 

[westward10]

I only tend to enter a switch-fuse if it is a distribution circuit, is it being used to isolate equipment.

 

[snipersmith87]

Earlier I had a 3ph 32amp MCB supplying some 32amp commandos with isolators. They'd then tapped off to a 32amp fused isolator. (To supply another commando socket - I presume for local isolation)
The feed side of this was then supplying a 2w DB supplying a socket off a 16amp MCB. I've recorded the circuit feeding the commandos and then the sub DB.
But it got me thinking.
Should you do a separate (DB) on the cert each time the protective device changes????

 

[buzzlightyear]

Earlier I had a 3ph 32amp MCB supplying some 32amp commandos with isolators. They'd then tapped off to a 32amp fused isolator. (To supply another commando socket - I presume for local isolation)
The feed side of this was then supplying a 2w DB supplying a socket off a 16amp MCB. I've recorded the circuit feeding the commandos and then the sub DB.

is this existing ?are you doing a eicr.

 

[snipersmith87]

is this existing ?are you doing a eicr.

Yes existing Buzz

 

[Octopus]

Should you do a separate (DB) on the cert each time the protective device changes????

IMHO - Yes

 

[snipersmith87]

I don't quite get why they didn't just follow suit with the existing interlock sockets. Rather than putting a 32 amp switch fuse??

 

[buzzlightyear]

I wish people would come clean when asking this forum ,it would help. its like extracting teeth out of some body .

 

[snipersmith87]

IMHO - Yes

So in my scenario you would have for the 32amp switch fuse interlock??

I wish people would come clean when asking this forum ,it would help. its like extracting teeth out of some body .

???

 

[Octopus]

So in my scenario you would have for the 32amp switch fuse interlock??

If I understand your description correctly!

Could you do a sketch of the connections and upload it as a photo?

 

[buzzlightyear]

If I understand your description correctly!

Could you do a sketch of the connections and upload it as a photo

possible sub mains ,who knows .

 

[snipersmith87]

I only tend to enter a switch-fuse if it is a distribution circuit, is it being used to isolate equipment.

I only tend to enter a switch-fuse if it is a distribution circuit, is it being used to isolate equipment.

possible sub mains ,who knows .

Its not a sub main. It's a fused interlock isolator supplying a 32amp commando socket directly below. A 10mm T and E has been taken out of the supply side to a 2w DB next to it. Main switch and 16amp MCB. This supplies a socket below.

I have recorded on test sheet the circuit supplying commandos and Interlock. The sub main DB supplying socket.

My question is should you record every time the protective device changes.

 

[Octopus]

You need to sketch this out, take a photo and upload it!

 

[buzzlightyear]

My question is should you record every time the protective device changes.

when and why ?

 

[snipersmith87]

when and why ?

Isn't that what we do with a DB??? To ensure protective devices will operate within required times???? Fuses are the same??

 

[ipf]

It's not my idea of doing things...…..need a single phase supply so pick up from a local 3 phase circuit point. It should have a separate supply as a single phase circuit....BUT, which regulation gives non compliance?
As regards the DB, it's been taken from a final sub circuit so what is the difference between that and a fixed fused spur.
I wouldn't treat it as separate DB with it's own schedule but make a note on the cert.
Edit. What about rcd with the socket?

 

[snipersmith87]

when and why ?

Isn't that what we do with a DB??? To ensure protective devices will operate within required times???? Fuses are the same??

It's not my idea of doing things...…..need a single phase supply so pick up from a local 3 phase circuit point. It should have a separate supply as a single phase circuit....BUT, which regulation gives non compliance?
As regards the DB, it's been taken from a final sub circuit so what is the difference to that and a fixed fused spur.
I wouldn't treat it as separate DB with it's own schedule but make a note on the cert.[/QUOTE

It's not my idea of doing things...…..need a single phase supply so pick up from a local 3 phase circuit point. It should have a separate supply as a single phase circuit....BUT, which regulation gives non compliance?
As regards the DB, it's been taken from a final sub circuit so what is the difference to that and a fixed fused spur.
I wouldn't treat it as separate DB with it's own schedule but make a note on the cert.

Thankyou

 

[westward10]

IMHO - Yes

You do this for fcus in a house?

 

[snipersmith87]

You do this for fcus in a house?

No I totally agree Murdoch. This is where I'm starting to confuse myself.