There are a couple of very different "real life" issues here.
If you have volunteered to be in charge of sound for a choir concert at your
local church, and it's fifteen minutes to showtime, and you've got hum in
the PA system, you will doubtless pull every rabbit out of every hat you can
think o
;s LVD, but I didn't know
whether the actions of OSHA and similar bodies had a similar effect to the
LVD.
All the very best!
Keith Armstrong
In a message dated 20/03/02 20:04:01 GMT Standard Time,
mertino...@skyskan.com writes:
> Subj:RE: Pro-audio and ground lifting
> Date:20/0
as result of safety legislation
such as the European LVD.
All the very best!
Keith Armstrong
In a message dated 20/03/02 18:55:51 GMT Standard Time,
ken.ja...@emccompliance.com writes:
> Subj:Re: Pro-audio and ground lifting
> Date:20/03/02 18:55:51 GMT Standard Time
> From:ken.ja..
I read in !emc-pstc that Chris Maxwell wrote
(in <83d652574e7af740873674f9fc12dbaaf7e...@utexh1w2.gnnettest.com>)
about 'Pro-audio and ground lifting', on Wed, 20 Mar 2002:
>I have a feeling that
>"hum" could be solved by power filtering without disconnecting
I read in !emc-pstc that Ted Rook wrote (in
) about 'Pro-audio and ground lifting', on Wed,
20 Mar 2002:
>Ground lift switches do not affect the protective ground electrical connection
>between the AC third wire and the equipment chassis.
The trouble is that the term 'grou
Well,
What's legal?
What's smart?
What gets by unnoticed?
What is practical?
What's legal:
If a product is Class 1 (needs Earth Ground) then legally it needs to
have its ground conductor plugged in. That's regardless of if it's the
US, UK, U(anywhere).I say "legally" in the sense that yo
, or point me to US regulations or standards of codes of
practice that permit it.
All the very best!
Keith Armstrong
www.cherryclough.com
In a message dated 20/03/02 20:01:41 GMT Standard Time, t...@crestaudio.com
writes:
> Subj:Re: Pro-audio and ground lifting
> Date:20/03/02 20:01:41 G
.org
>
> I read in !emc-pstc that cherryclo...@aol.com wrote (in <17d.557eff5.29c
> a1...@aol.com>) about 'Pro-audio and ground lifting', on Wed, 20 Mar
> 2002:
> >Class I equipment uses basic insulation plus protective ground bonding
> to
>
This reply is a personal opinion and does not represent the views of my
employer.
Ground lift switches do not affect the protective ground electrical connection
between the AC third wire and the equipment chassis.
Ground lift switches separate the audio input and/or output shield connection
fr
best!
Keith
In a message dated 20/03/02 17:45:50 GMT Standard Time,
sergioro...@siemens.com.br writes:
> Subj:RES: Pro-audio and ground lifting
> Date:20/03/02 17:45:50 GMT Standard Time
> From:sergioro...@siemens.com.br (SERGIO LUIZ DA ROCHA LOURES)
> To:cherryclo...@ao
I read in !emc-pstc that cherryclo...@aol.com wrote (in <17d.557eff5.29c
a1...@aol.com>) about 'Pro-audio and ground lifting', on Wed, 20 Mar
2002:
>Class I equipment uses basic insulation plus protective ground bonding to
>protect against electrical hazards, and mu
related to me by an EMC engineer who used to work as a roadie.
--
From: cherryclo...@aol.com
To: emc-p...@ieee.org
Cc: t...@cadac-sound.com
Subject: Pro-audio and ground lifting
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, Mar 20, 2002, 10:59 AM
Dear Group
Does anyone know if it is
gador.
-Mensagem original-
De: cherryclo...@aol.com [mailto:cherryclo...@aol.com]
Enviada em: quarta-feira, 20 de março de 2002 13:59
Para: emc-p...@ieee.org
Cc: t...@cadac-sound.com
Assunto: Pro-audio and ground lifting
Dear Group
Does anyone know if it is legally permissible in the USA to remove the safety
grounds from Class I equipment used in pro-audio systems and installations?
It has been a common practice over many many years in professional audio
systems and installations to 'lift the grounds' on equip
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