It's not the presence of the voltage itself that causes problems. It's the damage to the cable. The cable will eventually break down, or melt, or burn through. When it does, the center conductor will short to the outer conductor and cause picture problems. In other cases, the jacket of the cable will melt and let water in. The customer doesn't notice a picture problem until something like this happens.
Sometimes the same thing may cause AC hum in the picture, but normally it doesn't. The customer doesn't know about the problem until the picture problems start. The 28 volts you mentioned may have been there long enough for someone to notice it. The house you mentioned with the 70 volts AC on the line will eventually be a problem.
Until a picture problem develops, the customer isn't going to notice a problem. Hopes this helps.
Re: AC voltage on in-house lines
Member #: 36232
Registered: 2/16/2005
Posted:
218
Name:
Rob
Occupation:
Engineer
Location:
Sunny Florida
There is 1 reply to this message
