Hi, Ralph. For a few days, this list worked like most others, in that
the 'Reply to' was to the list and not the writer, which seems logical.
But I see it's now 'Reply to writer, CC to list', which means that
everyone who replies gets two copies.
I almost agree with you about those UL standards that accept two layers
of insulation rated for the higher voltage, except that it doesn't take
mechanical damage, resulting in power-cross. Securing fixes that.
Of course, most of the standards are not based on the 'Hazard-based'
principle, yet, and it will take many years for it to penetrate, unless
there is some sort of revolution. So we will have to live with these
'seemed like a good idea at the time' requirements.
On 2024-10-18 20:49, [email protected] wrote:
Hi John,
I never understood rationale for segregating and separating insulated
wires of different circuit from one another. I can understand the
need to separate and secure insulated wires from uninsulated live
parts and SELV wires from hazardous live bare parts. I recall reading
in one or two UL standards that if both hazardous and SELV wires are
insulated to the higher working voltage of the two, no separation or
barrier is required.
Ralph
*From:*John Woodgate <[email protected]>
*Sent:* October 18, 2024 11:02 AM
*To:* [email protected]
*Subject:* Re: [PSES] Separation of AC and DC Conductors in Control
Cabinet
A quarter-inch doesn't seem big enough to have any effect beyond air
insulation. On the other hand, why is it necessary to separate
insulated AC and DC cables, as long as they are identified by colour
or shape. Securing is important: cables can jump about under
high-current fault conditions, and can become detached from terminals.
On 2024-10-18 18:30, Ralph McDiarmid wrote:
Hi James,
Most UL standards I’ve work with require segregation of
factory-installed wiring by clamping or routing to provide a
secure and permanent separation. For field wiring compartments,
a barrier between conductors of different circuits is needed and
openings in the wiring compartment to facility that separation.
For a control cabinet intended for installation in the USA, I
would consult /UL 508 Industrial Control Equipment/, and that
standard calls for a minimum separation distance of ¼ inch.
Ralph
*From:*James Hulbert
<[email protected]>
<mailto:[email protected]>
*Sent:* October 18, 2024 9:44 AM
*To:* [email protected]
*Subject:* [PSES] Separation of AC and DC Conductors in Control
Cabinet
Happy Friday! Within a control cabinet, AC and DC conductors
should not be co-mingled. Is there a specification for minimum
separation distance? A minimum separation of 2 inches seems to be
a standard practice, but is there a specification or standard that
calls that out? Thank you.
Jim Hulbert
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