Question time!
I asked Richard Burns if he would like to set the question for me and this is what we have agreed on....
This is intended to be a fairly simple question that should be answerable by anyone at any level of training. Starting Trainees can ask for the clue to help direct your answer as you may not have covered all aspects.
Do read the question carefully.
This is meant to get you thinking about the requirements of the regulations and methods of providing compliant solutions in a easy manner.
A new radial circuit has been designed to add to an existing compliant installation to provide power to socket outlets in a large office adjacent to a stable complex and across a path from a farmhouse where the service head is located. There is no extraneous metalwork in the office.
The supply is a single phase TNS supply protected by a BS88-3 100A fuse, the Ze is 0.37Ω and Zdb is 0.39Ω
The final circuit runs from the Consumer unit in the room and is protected by a B curve RCBO rated at 32A 30mA Ics 6kA, it is anticipated that the circuit will be used to capacity.
The circuit is run in 4.0mm² PVC insulated copper cable in plastic trunking with drops in plastic conduit to surface mounted BS1363 sockets
There are double sockets spaced around the walls of the room to create a maximum circuit length of 45m..
Is this design compliant with BS7671:2008 AMD1 2011?
If not what straightforward change(s) could be made to the design to ensure that the circuit is compliant?
The design diagram is attached along with some design notes
![[ElectriciansForums.net] Competition Question 18th April 2015](https://electricians.s3.eu-west-1.amazonaws.com/data/attachments/20/20094-9bb8119267a1f66b487f7d2843641323.jpg "[ElectriciansForums.net] Competition Question 18th April 2015")
Richard was worried about finding a question that is not to hard for new trainees and also not to easy for the more experienced trainees, as an extra help for any new guys that would like to enter he has kindly said any new trainees can drop him a PM if they are stuck and he will offer assistance!
All answers to be sent in via a PM to myself so everyone who wants to enter can have a go
I'll speak to Paul today about a closing date for the comp and a system for picking the winner.
Good luck guys!
I asked Richard Burns if he would like to set the question for me and this is what we have agreed on....
This is intended to be a fairly simple question that should be answerable by anyone at any level of training. Starting Trainees can ask for the clue to help direct your answer as you may not have covered all aspects.
Do read the question carefully.
This is meant to get you thinking about the requirements of the regulations and methods of providing compliant solutions in a easy manner.
A new radial circuit has been designed to add to an existing compliant installation to provide power to socket outlets in a large office adjacent to a stable complex and across a path from a farmhouse where the service head is located. There is no extraneous metalwork in the office.
The supply is a single phase TNS supply protected by a BS88-3 100A fuse, the Ze is 0.37Ω and Zdb is 0.39Ω
The final circuit runs from the Consumer unit in the room and is protected by a B curve RCBO rated at 32A 30mA Ics 6kA, it is anticipated that the circuit will be used to capacity.
The circuit is run in 4.0mm² PVC insulated copper cable in plastic trunking with drops in plastic conduit to surface mounted BS1363 sockets
There are double sockets spaced around the walls of the room to create a maximum circuit length of 45m..
Is this design compliant with BS7671:2008 AMD1 2011?
If not what straightforward change(s) could be made to the design to ensure that the circuit is compliant?
The design diagram is attached along with some design notes
Richard was worried about finding a question that is not to hard for new trainees and also not to easy for the more experienced trainees, as an extra help for any new guys that would like to enter he has kindly said any new trainees can drop him a PM if they are stuck and he will offer assistance!
All answers to be sent in via a PM to myself so everyone who wants to enter can have a go
I'll speak to Paul today about a closing date for the comp and a system for picking the winner.
Good luck guys!
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