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Danny k
Hi, I've been asked by a friend to install a new 60898 17 edition CCU, in replacement of an old 3036 CCU. The whole setup is TN-S and from the 100A supplers fuse the tails run to an old electromechanical watt-hour meter, then the live tail from the metre runs of to the 3036 CCU and the same for the netrual.
From the CCU you have 3 semi enclosed fuses that supplys lights and sockets of the downstairs, i'm not 100 % as to what they are, until i have a good look, but i know you have T+E coming out from the CCU going to a seperate single CCU located no more then a meter away that is a breaker supplying the cocker and another T+E cable going to another seperate twin CCU supplying more lights and sockets for the property.Really, he just wants it all cleaned up and on one main CCU.
So i have no problem isolating the supplying that runs around the house, i am only quilifed up to Level 2 C+G and am quite capable of following the safe isolation procdure, what gets abit tricky is i have no test equipment to test any of the cable calculations for fuse sizes nor to do any inspection and testing and to be 100 % in my work even though i want legally be able to give the work a certificate because i am not part P quilified.
What I know is as on the current CCU|:
Sockets are on a 30 A fuse.
Lights are on a 5 A fuse.
Cooker is on a 40 A fuse.
Surley if i was to isolate the supply install the 17th edition CCU,(wiring is the old RED and BLACK), put sockets on one side of an RCD and lights and cooker on another side of another RCD being 32A sockets, 6A normal lights and 40A cooker, i should be fine as there apparently hasn't been any problems, with his current setup.
Legally would i be OK doing this and want come of any trouble if everything contiunes to run correctly....
* I know not to touch the naked copper cable of the tail leads that go from the metre to the actual CCU.
* I don't think i have any need to mess with any earth bondings etc, as that runs visably to the cable sheath, i would only earth from the CCU to the main protective earthing terminal, which is already in place on the old 3036 CCU and would just be a replacement into the new CCU.
From the CCU you have 3 semi enclosed fuses that supplys lights and sockets of the downstairs, i'm not 100 % as to what they are, until i have a good look, but i know you have T+E coming out from the CCU going to a seperate single CCU located no more then a meter away that is a breaker supplying the cocker and another T+E cable going to another seperate twin CCU supplying more lights and sockets for the property.Really, he just wants it all cleaned up and on one main CCU.
So i have no problem isolating the supplying that runs around the house, i am only quilifed up to Level 2 C+G and am quite capable of following the safe isolation procdure, what gets abit tricky is i have no test equipment to test any of the cable calculations for fuse sizes nor to do any inspection and testing and to be 100 % in my work even though i want legally be able to give the work a certificate because i am not part P quilified.
What I know is as on the current CCU|:
Sockets are on a 30 A fuse.
Lights are on a 5 A fuse.
Cooker is on a 40 A fuse.
Surley if i was to isolate the supply install the 17th edition CCU,(wiring is the old RED and BLACK), put sockets on one side of an RCD and lights and cooker on another side of another RCD being 32A sockets, 6A normal lights and 40A cooker, i should be fine as there apparently hasn't been any problems, with his current setup.
Legally would i be OK doing this and want come of any trouble if everything contiunes to run correctly....
* I know not to touch the naked copper cable of the tail leads that go from the metre to the actual CCU.
* I don't think i have any need to mess with any earth bondings etc, as that runs visably to the cable sheath, i would only earth from the CCU to the main protective earthing terminal, which is already in place on the old 3036 CCU and would just be a replacement into the new CCU.