Richard,
I'm a little less ebullient today than yesterday. Recognized
Hot-swappable connectors exist but I sure can't find any way to quickly
identify them. The UL classification is ECBT2. (Connectors for use in data,
signal, and Power applications.) The UL guide information indicates that
"unless otherwise specified in the individual recognitions, ...." the
connectors have not been evaluated for current interruption.
I began looking at both the UL on-line database and in an old
recognition handbook, but no where could I find a reference to having been
evaluated for current interruption. Of course I couldn't find any indication
of the other things mentioned in the guide, such as conductor securing
testing etc.
So I decided to next check out some folks like Positronic who would
likely have such a beast. Sure enough on their site for the Infinity series
that it is "hot-pluggable (50 couplings per UL 1977 paragraph 15)" and they
give a couple of contact sizes. (Earlier they give the UL and CSA file
numbers)
But here is the text from the UL data base
Cat. No. IP followed by 18, 33, 48 or 56, followed by F or
M, followed by any 4 digit alphanumeric code.
No indication of meeting and of the "unless otherwise specified"
items listed in the UL guide information for this category.
Looks like there is no easy way to screen the connectors, you'll
have to check with each vendor you are considering.
Rats, so much for being a list-server information super hero - Ah
well, tis the weekend and somebody has to go out and keep beer out of the
hands of children so I'm off to the pub to destroy as much of it as I can.
Gary
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, June 21, 2001 9:30 AM
To: [email protected]
Subject: RE: Hot Swappable Power Supplies ?
Gary, is the hot swappable approval included in the UL Conditions of
Acceptability or is a different component category?
Richard Woods
----------
From: Gary McInturff [SMTP:[email protected]]
Sent: Thursday, June 21, 2001 11:41 AM
To: 'Lesmeister, Glenn'; [email protected]
Subject: RE: Hot Swappable Power Supplies ?
They have "hot swappable connectors" that have already been
subjected to the
test as part of the component recognition, but I don't remember the
CCN
number.
-----Original Message-----
From: Lesmeister, Glenn [mailto:[email protected]]
Sent: Thursday, June 21, 2001 6:26 AM
To: [email protected]
Subject: RE: Hot Swappable Power Supplies ?
Richard,
What is the test plan for making and breaking under load? In
general, power
supplies take a little bit of time to start up, so making contact
under load
is not going to be an issue. UL has specified a 200 cycle
disconnect test
and all they are concerned with is condition of the contacts
afterward.
They do not specify how fast you have to plug the supply from the
connector,
so this could be a factor. Typically, they have a short signal pin
that
must be fully seated for the supply to operate. Once you start
pulling the
supply, the signal pin breaks first and shuts down the high current
before
those contacts break. The slower you pull, the less likely you will
draw an
arc. Or course, the fast you pull, the shorter duration the arc.
Regards,
Glenn Lesmeister
Product Regulatory Compliance
Compaq Computer Corp. Tel: 281-514-5163
20555 SH 249, MS60607 Fax: 281-514-8029
Houston, TX 77070-2698 Pgr: 713-786-4930
[email protected]
"I am empowered to do what makes sense!"
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, June 21, 2001 6:35 AM
To: [email protected]
Subject: RE: Hot Swappable Power Supplies ?
We are currently evaluating a system with hot swappable power
supplies and
PCBs and here is what we have found needs to be checked:
o Earthing pin makes first and breaks last
o Primary and secondary power connectors are rated for
make/break
application
o Access to hazardous voltages and energy hazards
o Capacity of paralleled outputs may exceed energy hazard
limits (we
are adding PTCs on the backplane for each PCB which are also hot
swappable)
Richard Woods
----------
From: Richardson, William G
[SMTP:[email protected]]
Sent: Wednesday, June 20, 2001 5:50 PM
To: 'Dan Teninty'
Cc: '[email protected]'
Subject: RE: Hot Swappable Power Supplies ?
There must be a bleeder resistor (across the X caps) to make
the AC
input
pins safe to touch once the supply is removed from the
cabinet.
If there are exposed voltage or energy hazards with the
supply
removed,
there must be a restriction such that only trained personnel
are
instructed
to do this OR a tool must be used to remove the supply.
-----Original Message-----
From: Dan Teninty [mailto:[email protected]]
Sent: Wednesday, June 20, 2001 4:16 PM
To: Emc-Pstc@Majordomo. Ieee. Org
Subject: Hot Swappable Power Supplies ?
Do any of my esteemed colleagues know of any specific
requirements
in 60950
(UL/CSA or EN) relating specifically to hot swappable power
supplies? A
search in the PDF version of UL/CSA 60950 reveals nothing
specific
when
searching for "hot", "swap", or "power supply". A visual
search of
the TOC
also reveals nothing specific.
2.6.5.4 deals with :
Parts that can be removed by an operator
Protective earthing connections shall make earlier and break
later
than the
supply connections
in each of the following:
- the connector of a part that can be removed by an
OPERATOR;
- a plug on a power supply cord;
- an appliance coupler.
Compliance is checked by inspection.
This is the most I could find that was related, and then it
is
referring to
the AC side.
Thought I would triple check with the collective brain trust
to be
sure.
Appreciate any pointers to passages that I missed.
Thanks,
Daniel E. Teninty, P.E.
Managing Partner
DTEC Associates LLC
Streamlining the Compliance Process
5406 S. Glendora Drive
Spokane, WA 99223
(509) 443-0215
(509) 443-0181 fax
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