Sumer house -sub board Zs!?

[NEBITOMI]

hello
i would like to know maximum zs at the sub board !
i used the house otside socket feed to summer house!
i connected one outdoor fused spur under the socket ,with 13a fuse!and that feed small fuseboard in the summer house!
1-6a lighting
1-10a socket circuit!
i took the zs reading at the socket (0,45 ohm)
in this case how much is the maximum zs at the S.H.distribution board allowed,permitted?
thank you!

 

[ChrisElectrical88]

Not sure about in your country, but in the UK it would been seen as bad practice to feed a new DB from an existing socket circuit.
The maximum Zs would depend on the OCPD in place.

 

[cliffed]

Looks ok the Zs,but there will be other things to take into account .
Any extraneous parts to be earthed/bonded & Rcd protection,volt drop.
[automerge]1591526559[/automerge]
3.83 ohms on 13 amp fuse.

 

[NEBITOMI]

30ma RCD FITTED IN THE sub board !
[automerge]1591526769[/automerge]
THE SUMMER HOUSE NO WATER OR GAS!AND WOOD HOUSE!NO EXTRANEOUS PARTS!
THIS S WILL BE BICICLE STORAGE AND GENERAL STORAGE!

 

[ChrisElectrical88]

Surely the outdoor socket circuit already had 30mA RCD protection?
atleast we know your in the UK now you have changed your country.

 

[NEBITOMI]

Surely the outdoor socket circuit already had 30mA RCD protection?
atleast we know your in the UK now you have changed your country.

YES IT HAS 30 MA RCD

 

[ChrisElectrical88]

YES IT HAS 30 MA RCD

So why have you also put a 30mA RCD in the sub board in the summer house.
Surely the best set up for this would have been to go from the outdoor socket, into a 13A FCU, Straight into the summer house socket with the light coming off a 3A FCU next to the summer house socket?

 

[NEBITOMI]

So why have you also put a 30mA RCD in the sub board in the summer house.
Surely the best set up for this would have been to go from the outdoor socket, into a 13A FCU, Straight into the summer house socket with the light coming off a 3A FCU next to the summer house socket?

YES! YOU ARE RIGHT! BUT WHAT THE PROBLEM WITH THE SUB FUSEBOARD IF THE CUSTOMER ALREDY BOUGHT THAT! I DONT WANA SAY I DONT CONNECT IT UP!
I CANT SEE ANY ISUE FOR THE SUB BOAR! OR YOU CAN SEE THE PROBLEM?

 

[Andy78]

YES! YOU ARE RIGHT! BUT WHAT THE PROBLEM WITH THE SUB FUSEBOARD IF THE CUSTOMER ALREDY BOUGHT THAT! I DONT WANA SAY I DONT CONNECT IT UP!
I CANT SEE ANY ISUE FOR THE SUB BOAR! OR YOU CAN SEE THE PROBLEM?

You should see the section in BS7671 about RCD selectivity if you have 2 30mA RCD devices in line with each other.

 

[ChrisElectrical88]

YES! YOU ARE RIGHT! BUT WHAT THE PROBLEM WITH THE SUB FUSEBOARD IF THE CUSTOMER ALREDY BOUGHT THAT! I DONT WANA SAY I DONT CONNECT IT UP!
I CANT SEE ANY ISUE FOR THE SUB BOAR! OR YOU CAN SEE THE PROBLEM?

I would have told the customer to take it back. You now have 2 30mA RCDs in place along with a 10A MCB for a twin socket, that’s likely to trip. Also a Sub Board fed off a existing socket circuit, I’m sorry isn’t for me at all.

 

[NEBITOMI]

You should see the section in BS7671 about RCD selectivity if you have 2 30mA RCD devices in line with each other.

YES I KNOW IT WILL TRIP BOTH! BUT EVEN IF THE FAULT OCCURE IT WOULD TRIP IN THE HOUSE ANYWAY!!

 

[Andy78]

YES I KNOW IT WILL TRIP BOTH! BUT EVEN IF THE FAULT OCCURE IT WOULD TRIP IN THE HOUSE ANYWAY!!

Ah well just ignore it then eh ? ?

 

[ChrisElectrical88]

What was the size of the circuit breaker in the house?

 

[NEBITOMI]

Ah well just ignore it then eh ? ?

TELL ME WHAT CAN BE WRONG WITH IT?
[automerge]1591529092[/automerge]

What was the size of the circuit breaker in the house?

16A

 

[JBW175]

Why you SHOUTING? Turn off Caps lock mate, it comes across as being aggressive.

 

[ChrisElectrical88]

Well your Zs reading was fine then to answer your original question. I’ve said what I need to above, I’ll leave someone else to tell you further how your design is a crock.

 

[buzzlightyear]

Are you practicing being a spark considering
You are doing some work for a client.

 

[Strima]

Sounds like a very poor circuit design with needless expense on materials. The max Permitted Zs would be the OCPD at the source of the supplying circuit, 16 amp MCB.

Pointless having a DB in the outbuilding if it's been fed from a final circuit.

 

[Baddegg]

Don’t think you should be doing work in people’s property mate....that’s pretty basic stuff....

 

[NEBITOMI]

Don’t think you should be doing work in people’s property mate....that’s pretty basic stuff....

OK! I WILL NOT DO ANYTHING! THANK YOU! HAVE NICE DAY!