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Why do stereo components lack ground plugs?

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H. R. Bob Hofmann

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Why do stereo components lack ground plugs?

(Barry Mann) wrote in message . com...
In , on 09/09/03
at 11:13 PM, (J. Tyler) said:

Does anyone know the main reason computers have 3-pronged plugs but
most consumer stereo gear doesn't? Is it less vulnerable to surges,
even with all the microprocessors in modern receivers?

JT

P.S. I notice laptops rarely have ground plugs either. Must be a clue
there.

Sometimes I wonder if anyone has a clue about this issue.

The non-use of a grounding plug implies that the object to which it is
connected is "double-insulated" so that a double fault must occur
before the user can get an electrical shock (short of going swimming
with the device plugged in - then the GFI circuit near the swiming
pool or bathroom or whatever is supposed to protect the dumb fool that
goes swimming). In the case of a computer, as noted earlier, the
wall-wart provides double insulation for the electrical dc output that
goes to the computer. If stereos, tvs, etc used wall-warts, they could
also be provided with no grounding plugs. In fact, the tv sets use
insulating techniques inside the tv sets that qualify them for the
"double-insulating" ratings, as far as I know. It would be helpful if
someone from UL was on the newsgroup.

H. R. (Bob) Hofmann

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