Newsgroups: rec.audio.tech
Subject: Re: Speaker Hum coming from CD player.
References:    
"vMike"  writes:

> I thought it might be a hazard also, but after read the manual more
> carefully, it suggested using one of those old fashioned adapters for two
> prongs outlets and said to make sure the ground wire is NOT connected. 

OK. So they designed the equipment in s such way that it is safe to 
operate without ground (=double insulation) but provided a ground 
connection. In this case removing the ground sounds like an usable idea.

> They
> had even included one in the box but I had thrown it out thinking who would
> need this HA. Anyway I left enough of the ground lug so that it can't be
> inserted into the socket the wrong way, which I think is much more of a
> hazard, but not enough to make the connection.

In an equipment which is designed to be safe to operate without ground 
(=double insulated construction) installing the connector on the 
"wrong way" is not more hazard than removing the gound in the 
same equipment. 

For example many countries around Europe use SCHUKO connector, which
is a grounded power outlet where the connector can be fitted to 
the connector in two ways. And practically all small non grounded 
equipment use an europlug mains connector which cna be plugged to 
most outlets around Europe. And in every place it can be plugged, 
it can be plugged in in two ways. 

-- 
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at 
http://www.epanorama.net/