John,
Here is the relevant text. Bolding added for emphasis:
EN 60204-1:2006
11 Controlgear: location, mounting, and enclosures
11.1 General requirements
All controlgear shall be located and mounted so as to facilitate:
- its accessibility and maintenance;
- its protection against the external influences or conditions under
which it
is intended to
operate;
- operation and maintenance of the machine and its associated
equipment.
11.2 Location and mounting
11.2.1 Accessibility and maintenance
All items of control gear shall be placed and oriented so that they can
be
identified without moving them or the wiring. For items that require checking
for correct operation or that are liable to need replacement, those actions
should be possible without dismantling other equipment or parts of the machine
(except opening doors or removing covers, barriers or obstacles). Terminals
not part of controlgear components or devices shall also conform to these
requirements.
All controlgear shall be mounted so as to facilitate its operation and
maintenance from the front. Where a special tool is necessary to adjust,
maintain, or remove a device, such a tool shall be supplied. Where access is
required for regular maintenance or adjustment, the relevant devices shall be
located between 0,4 m and 2,0 m above the servicing level. It is recommended
that terminals be at least 0,2 m above the servicing level and be so placed
that copductors and cables can be easily connected to them.
No devices except devices for operating, indicating, measuring, and
cooling
shall be mounted on doors or on normally removable access covers of
enclosures. Where control devices are connected through plug-in arrangements,
their association shall be made clear by type (shape), marking or reference
designation, singly or in combination (see 13.4.5).
Plug-in devices that are handled during normal operation shall be
provided
with non-interchangeable features where the lack of such a facility can result
in malfunctioning.
PIug/socket combinations that· are handled during normal operation
shall be
located and mounted so as to provide unobstructed access.
Test points for connection of test equipment, where provided, shall be:
- mounted so as to provide unobstructed access;
- clearly identified to correspond with the documentation (see 17.3);
- adequately insulated;
- sufficiently spaced.
Normally this is taken to mean that pushbuttons, selector switches, pilot
lights, HMIs, cooling fans, and instruments may be mounted on doors or
removable covers. PLC's and remote I/O blocks are not normally included,
although you might be able to successfully argue that installing a remote I/O
block on the door lessens the amount of wiring that must cross the hinge, and
is therefore preferable to running discrete wiring.
Also note that there is a requirement for the wiring to be highly flexible:
13.3 Wiring inside enclosures
Conductors inside enclosures shall be supported where necessary to keep
them
in place. Non-metallic ducts shall be permitted only when they are made with a
flame-retardant insulating material (see the IEC 60332 series).
It is recommended that electrical equipment mounted inside enclosures be
designed and constructed in such a way as to permit modification of the wiring
>from the front of the enclosure (see also 11.2.1). Where that is not
practicable and control devices are connected from the rear of the enclosure,
access doors or swingout panels shall be provided.
Connections to devices mounted on doors or to other movable parts shall
be
made using flexible conductors in accordance with 12.2 and 12.6 to allow for
the frequent movement of the part. The conductors shall be anchored to the
fixed part and to the movable part independently of the electrical connection
(see also 8.2.3 and 11.2.1).
Conductors and cables that do not run in ducts shall be adequately
supported.
Terminal blocks or plug/socket combinations shall be used for control
wIFIng
that extends beyond the enclosure. For plug/socket combinations, see also
13.4.5 and 13.4.6.
Power cables and cables of measuring circuits may be directly connected
to
the terminals of the devices for which the connections were intended.
Section 12.2 deals with wiring materials, gauge and ampacity. Section 12.6
deals with the specific requirements for flexible cables. I'll leave you to
review those sections on your own.
Feel free to contact me with any questions.
Happy Holidays to all!
--
Doug Nix, A.Sc.T.
IEEE PSES Toronto Chapter
Toronto Section, Ontario, Canada
[email protected]
office: +1 (519) 650-4753
mobile +1 (519) 729-5704
fax +1 (519) 653-1318
Find me LinkedIn at http://www.linkedin.com/in/dougnix
On 22-Dec-09, at 09:27 , John Cochran wrote:
I have asked for the specific standard and clause that the inspector is
using
to declare our cart is unacceptable for installing components on the door.
The product is a mobile control station for use in industrial process control.
It contains a server and UPS in the main enclosure, with a Control Logix
controller, Ethernet router and 24VDC power supply on the door. Main incoming
power is terminated in the main enclosure through a 16A breaker and protective
earth ground is permanently connected to the stainless steel enclosure. The
power is then run to the UPS in the main enclosure bottom, then out of the UPS
to the door for distribution to all the components through 5A breakers. This
also includes coming back across the door hinge to the server and display. A
separate permanently attached ground braid is run between the main enclosure
and the door, to connect protective earth to the door. Guess I have to look
at the EN60204 and see if I can find any problems with our wiring practices.
John
From: [email protected] [mailto:[email protected]] On Behalf Of John
Allen
Sent: Monday, December 21, 2009 9:10 PM
To: Doug Nix
Cc: [email protected]
Subject: Re: [PSES] Electrical components on hinged panels
Pretty sure it's allowed but would have to verify. EN60204 should be
the
Standard for the panel. Ask the inspector to point to a Standard and clause.
On Dec 21, 2009, at 5:50 PM, Doug Nix <[email protected]> wrote:
John,
Is this industrial equipment?
--
Doug Nix, A.Sc.T.
IEEE PSES Toronto Chapter
Toronto Section, Ontario, Canada
[email protected]
mobile (519) 729-5704
fax (519) 653-1318
Find me LinkedIn at http://www.linkedin.com/in/dougnix
Fostering Technological Innovation and Excellence for the
Benefit of
Humanity. Celebrating 125 Years of Engineering the
Future.http://www.ieee125.org
On 21-Dec-09, at 17:51 , John Cochran wrote:
Do you know if there is a CE compliance issue with attaching
electrical
components to a hinged door? For ease of construction, we often attach
components to the access door of our industrial control panel enclosures. UL
has evaluated our construction methods and certified us a UL508 Panel Shop.
Criteria is that a solid earth ground is attached to the door, and all
electrical cables are protected against damage. We are being told by a
customer that electrical components are never allowed on a door, in compliance
with CE. If UL finds it acceptable, I am not sure why it would be
unacceptable for Europe. I have seen many enclosures in Europe with
electrical components on a removable panel or door. Is the inspector
exercising personal preference, or is there a compliance standard that backs
up this decision to reject our wiring practices?
Thanks,
John Cochran
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