Re: intermittent low lvoltage lproblem
Shocks from a water pipe means you have a bad bond between your neutral (white wire) and ground. The neutral should be bonded to ground and to the service panel sheetmetal at the main disconnect (usually located at the meter panel). This connection is called the main bonding jumper. It should NEVER be grounded anywhere else. This allows proper tripping of the overcurrent device during a ground fault. This can be deadly. Get it fixed. So....that said, if your neutral wire from the power company is loose or disconnected, you will see part of your house go dim and another go brighter when you change loads. The power company will check to make sure their connections are good up to the meter panel. If the voltage goes low on one circuit, but is normal on all others, then you have a poor connection on one of the "hot" legs or the neutral for that circuit only. Check all of the connections in your breaker panel for tightness or overheating. Turn the breakers off first to be safe. If you don't have a main breaker, the power company will probly pull your meter for free if it's normal working hours.
Just because you can, it doesn't mean you should!