AlexM
09-06-2011, 16:11
Hi,
I am in the process of some electrical re-working of my installation in preparation for a move of my system to a new location in the room.
I have installed a new Memera consumer unit, and have made allowances for four radial circuits on individual MCBs. Wiring between the consumer unit and the sockets is via some very heavy twin and earth cable (10mm). Each radial circuit will be terminated as a double or single 3-pin switched outlet.
My question is how should i connect my equipment to minimize the chances of an earth loop, causing hum. As the cable runs to the consumer unit will be short and the earth connections within the consumer unit will share a bus bar, earth resistance should be very low, and maybe there won't be an issue, but I have suffered from ground loops in the past and am very keen to avoid this with the new installation.
So.. this leaves me with a couple of questions..
1) How to best arrange power leads and sockets to minimize ground loops. As an example, should my sources and the preamp be plugged into a double socket together, or the preamp and the power amp etc, power amp into a single etc.
2) How to reduce noise injection into the mains by unavoidable switched mode PSUs - separate them onto their own radial circuit? All are class 2 devices with no earth connection.
3) Anything else I should be considering?.
Thanks in advance for any advice or input.
Alex
I am in the process of some electrical re-working of my installation in preparation for a move of my system to a new location in the room.
I have installed a new Memera consumer unit, and have made allowances for four radial circuits on individual MCBs. Wiring between the consumer unit and the sockets is via some very heavy twin and earth cable (10mm). Each radial circuit will be terminated as a double or single 3-pin switched outlet.
My question is how should i connect my equipment to minimize the chances of an earth loop, causing hum. As the cable runs to the consumer unit will be short and the earth connections within the consumer unit will share a bus bar, earth resistance should be very low, and maybe there won't be an issue, but I have suffered from ground loops in the past and am very keen to avoid this with the new installation.
So.. this leaves me with a couple of questions..
1) How to best arrange power leads and sockets to minimize ground loops. As an example, should my sources and the preamp be plugged into a double socket together, or the preamp and the power amp etc, power amp into a single etc.
2) How to reduce noise injection into the mains by unavoidable switched mode PSUs - separate them onto their own radial circuit? All are class 2 devices with no earth connection.
3) Anything else I should be considering?.
Thanks in advance for any advice or input.
Alex