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To: Elroy who wrote (80275)	12/5/2012 8:34:22 PM
From: maceng2	Read Replies (1) of 110653

There is a fairly good section in wikipedia on "mains hum". The earth connections to your mains powered equipment are there for safety reasons. If a fault occurs on the live wire, the earth connection can make the system safe by providing a channel for current to flow thus blowing the fuse, circuit breaker or RCD rendering the system safe. Therefore only a knowledgeable certified person should change or modify earth connections. If your system is faulty, the last thing you want is for your body to provide the connection to earth. Be aware of that important fact. However, some very small harmless amounts of electricty may be present in any wire ot conducting surface by being inducted through the air. Any conducting wire can act exactly the same way an arial picks up a radio signal. You maybe wont feel it but the amount of electricity is enough to make a hum on an amplifier and speaker circuit. en.wikipedia.org/wiki/Mains_hum It is often the case that electric hum at a venue is picked up via a ground loop. In this situation, an amplifier and a mixing desk are typically at some distance from one another. The chassis of each item is grounded via the mains earth pin, and is also connected along a different pathway via the conductor of a shielded cable. As these two pathways do not run alongside each other, an electrical circuit in the shape of a loop is formed. and on ground loops. en.wikipedia.org So, if you have found a position for the cables where the hum has gone just leave at that. Otherwise proceed with caution, and/or get someone who is preferably certified on such equipment to check things out for you and is also familiar with the electricity supply in the region you are in.

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