short circuit


Old 07-14-02, 03:24 AM
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Question short circuit

My cable modem spark/ "short out" when attached to my desk top computer but not to the laptop computer when it is running on house power.

All three use the same grounded outlet and power strip. Where is the problem?
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Old 07-14-02, 05:30 AM
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I'd be asking this in the computer forum...which is where I have moved this...

Old 07-14-02, 07:06 PM
Join Date: May 2001
Location: Carol Stream, IL
Posts: 338
Contact your cable company. The difference in potential energy is coming from the cable line itself. They will need to put in a ground filter. (by the way, is the cable line grounded to a pipe or rod before it comes into the house and it can't be the same ground rod used by the AC)

The reason it doesn't affect the laptop is because the laptop is not really connect to the house power in the same way. Only the AC to DC converter is grounded the laptop itself is not. Hence, the difference in ground potential does not affect the laptop but does affect the desktop.

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