Hi Doug:
For EACH power cord (and protective conductor), ONE
PROTECTIVE CONDUCTOR TERMINAL.
In other words, you may have multiple PROTECTIVE
CONDUCTOR TERMINALS, but each one has its own
protective conductor to earth.
Each earthing system must comply with applicable
requirements. The equipment cannot rely on only
one of the earth connections. If one of the power
cords is disconnected, then the other power cord
must provide the earthing, and vice-versa.
You can indeed say that you have multiple protective
conductors. However, each protective conductor has
its own PROTECTIVE CONDUCTOR TERMINAL. So, in this
sense, you cannot say you have multiple PROTECTIVE
CONDUCTOR TERMINALs (which might imply multiple
PROTECTIVE CONDUCTOR TERMINALS for a single protective
conductor).
Best regards,
Rich
----- Original Message -----
From: American Idle <mailto:[email protected]>
To: Richard Nute <mailto:[email protected]>
Cc: Doug Kramer <mailto:[email protected]> ; [email protected]
Sent: Thursday, November 12, 2009 4:35 PM
Subject: Re: Protective Conductor Question
What if you have two or more power cords (redundant power supplies, for
example)? Then I would think that you can say you have multiple protective
conductors, even if only one is required/used.
On Thu, Nov 12, 2009 at 2:36 PM, Richard Nute <[email protected]> wrote:
Hi Doug:
Your equipment has only ONE protective conductor (in the
power cord). That one conductor connects the equipment to the
external
earth.
Within your equipment, the point of origin to which the
protective conductor
in the power cord is connected is the PROTECTIVE CONDUCTOR TERMINAL. Since
there is only one protective conductor in the power cord, there can be only one
PROTECTIVE CONDUCTOR TERMINAL.
Internally, you may connect one or more PROTECTIVE BONDING
CONDUCTORS (used
to internally connect other parts to earth) to the PROTECTIVE CONDUCTOR
TERMINAL.
There are some constructional rules for doing this.
Best regards,
Rich
----- Original Message ----- From: "Doug Kramer"
<[email protected]>
To: <[email protected]>
Sent: Thursday, November 12, 2009 9:58 AM
Subject: Protective Conductor Question
In IEC 61010-1:2001 paragraph 6.5.1.2 b) it states "The integral
protective conductor connection of an appliance inlet shall be
regarded
as the PROTECTIVE CONDUCTOR TERMINAL". Are there any cases
where the
protective conductor connection can be elsewhere when an IEC
appliance
inlet with ground is used? Can there be more than one
protective
conductor terminal?
Thanks,
Doug Kramer
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