Hi Doug:
I can't comment on 61010-1. However, I can comment
on equipotentiality and bonding.
Some definitions:
"Protective bonding" or "bonding" is the internal
current pathway from a part susceptible of becoming
live to the protective earthing terminal of the
equipment. No color is required (by IEC basic safety
standards) for this internal wiring, although it
is common to use green-yellow. (Green-yellow is
required for the conductor from the protective earthing
terminal to the external world earth, i.e., the power
cord.)
Standards committees can specify the color of internal
wiring, including bonding conductors.
If an accessible conductive part is not susceptible of
becoming live in the event of a fault *to that part*,
then bonding of that part is not required -- even
though the part may be connected to earth. And vice-
versa.
Equipotentiality (potential equalization) creates an
equipotential environment for a person. It's the most
general case. The usual case is that of connecting
all conductive parts to earth. Here's a video that shows
an equipotential environment for a helicopter and power
line worker:
http://www.youtube.com/watch?v=LIjC7DjoVe8
All conductive parts, including the helicopter, are
connected to the HV!
Enjoy!
Rich
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of Doug Powell
> Sent: Wednesday, February 15, 2012 12:38 PM
> To: emc-pstc
> Subject: EN/IEC 61010-1 Ed. 3 - Color Coding
>
>
> All,
>
> It seems there is a change in 61010-1 regarding the exclusive use to
> green / yellow color coded parts. In the past these colors were
> reserved solely for the use of the protective conductor, and
> protective bonding devices. This is generally true of safety
> standards based in or harminozed to 60664-1.
>
> Now I find in the third edition of 61010-1 has a provision for use of
> green / yellow on "potential equalization" and "functional earthing"
> in section 6.9.3 c) & d). In addition Table 1, symbol #8
> Equipotentiality (IEC 60417 - 5021) is removed from use. I always
> understood protective bonding is a mandatory safety connection and
> functional or equipotential ground are not and should not be used for
> electrical safety hazard protection.
>
> Can someone please explain the committee's rationale behind this? I
> really feel this waters down the importance of protective grounding
> and protective bonding; especially when working with high powered or
> high voltage equipment.
>
>
> thanks -doug
>
-
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