Manator
©Honorary Essex Boy™
OK guys as promised this week I start the new refurbishment of a surgery, all the existing electrical supplies will be removed apart from the 16mm twin and earth for the upstairs flat.
The survey pictures are here.
The new installation will be compliant with both MEIGaN and the HTM06 and of course BS7671.
The service head will not be changed it is not metal, and the neutral has been confirmed as linked and not fused. The box beneath the meter is where all the cables enter the meter outlet, at present there are 3 16mm tails connected to each terminal!
The first part of the project is to get the surgery up and running, so a new lighting circuit and surgery power supply will be installed via a new distribution board, keeping all connected services until a later date.
From the incomer to the surgery isolation is 20m, the cables will run in the cellar and up the wall in trunking to the isolator switch and earth reference bar, the position of this is on the wall just outside the surgery door.
So first questions given the above details in order to comply with medical locations what would be your cable choice? and perhaps why?
Second question the above flat is currently protected only by the distributors fuse, its overall run can not be verified other than to say it is installed within the fabric of the building and probably at a depth less than 50mm, how can we retro protect this with 30mA RCD and maintain the required protection? Remember single and double pole RCD's and how they differ.
Third and final question for tonight, there is a x ray to be fitted in the surgery the manufacturer requests that it is supplied from a 10amp 30mA RCD, remembering that this is a medical location and the required touch voltages required what would be your cable choice for this?
Remember also that cables can be of a lesser CSA because of the earth bonding, all services and final connections will be labelled individually to the earth reference bar.
Good luck and do not worry, its posted in the student and learning section because we are all students, I included.
The survey pictures are here.
The new installation will be compliant with both MEIGaN and the HTM06 and of course BS7671.
The service head will not be changed it is not metal, and the neutral has been confirmed as linked and not fused. The box beneath the meter is where all the cables enter the meter outlet, at present there are 3 16mm tails connected to each terminal!
The first part of the project is to get the surgery up and running, so a new lighting circuit and surgery power supply will be installed via a new distribution board, keeping all connected services until a later date.
From the incomer to the surgery isolation is 20m, the cables will run in the cellar and up the wall in trunking to the isolator switch and earth reference bar, the position of this is on the wall just outside the surgery door.
So first questions given the above details in order to comply with medical locations what would be your cable choice? and perhaps why?
Second question the above flat is currently protected only by the distributors fuse, its overall run can not be verified other than to say it is installed within the fabric of the building and probably at a depth less than 50mm, how can we retro protect this with 30mA RCD and maintain the required protection? Remember single and double pole RCD's and how they differ.
Third and final question for tonight, there is a x ray to be fitted in the surgery the manufacturer requests that it is supplied from a 10amp 30mA RCD, remembering that this is a medical location and the required touch voltages required what would be your cable choice for this?
Remember also that cables can be of a lesser CSA because of the earth bonding, all services and final connections will be labelled individually to the earth reference bar.
Good luck and do not worry, its posted in the student and learning section because we are all students, I included.
