Doug,
If I understand your description properly, the AC power cords run from the
power supplies and thence out of the box. This would negate shielding the
box (whose construction, as you describe it, is not encouraging, either)
might offer. It looks to me that as there would be a difference in
Anyone have any fresh ideas on how to improve
the overall chassis ground integrity of a hot box?
Let me explain - standard off the shelf box, about 4U
high, with 2 redundant AC power supplies. Bottom
and sides are one piece folded up, top cover is screwed
down. Primary ground comes through
On 14-Aug-01 Dan Pierce dpie...@openglobe.net wrote:
I have found that if I bypass the earth ground plug I can measure a 80
VAC potential from my chassis to earth ground. I found this out in the lab
when someone touched the chassis and a grounded bench and got zapped. Is
there guidelines
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Tuesday, August 14, 2001 10:37 AM
To: dpie...@openglobe.net
Cc: emc-p...@majordomo.ieee.org
Subject: Re: Hot Chassis?
Hi Dan:
with a three prong NA cord set. I have found that if I bypass the earth
ground plug I can
Do not rely on the word of some vendor employee with
regard to the safety criteria of the power supply.
Carefully read the CoA for that power supply.
If the CoA states compliance with the pertinent
standards as a Class I device, then there's nothing
you can do.
- Doug McKean
Nice e-mail 'schematic' !!
That's a first . . . for me!
John Juhasz
Fiber Options
Bohemia, NY
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Tuesday, August 14, 2001 12:37 PM
To: dpie...@openglobe.net
Cc: emc-p...@majordomo.ieee.org
Subject: Re: Hot Chassis
Dan
First thing, if the power supply is not double insulated, i.e. marked with the
square within the square, and is instead Class I Equipment, then forget what
the manufacturers has told you, that ground line forms an essential part of the
basic protection against electric shock. Do not by pass
Hi Dan:
with a three prong NA cord set. I have found that if I bypass the earth
ground plug I can measure a 80 VAC potential from my chassis to earth
This is normal.
Consider the circuit:
L o- 120 V rms
|
|
2200 pf
Sent by: To:
emc-p...@majordomo.ieee.org
owner-emc-pstc@majordomcc:
o.ieee.org Subject: Hot
I currently have a 110/220 power supply that has several 2200UF capacitors
tied to FGND two of which are tied to the AC lines in. This supply comes
with a three prong NA cord set. I have found that if I bypass the earth
ground plug I can measure a 80 VAC potential from my chassis to earth
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