I read in !emc-pstc that Price, Ed ed.pr...@cubic.com wrote (in
b78135310217d511907c0090273f5190d0b...@curly.ds.cubic.com) about 'best
screw/washer choices for attaching PCB to Chassis?' on Mon, 10 Feb 2003:
Put a dab of Locktite into the female thread on the PEM before assembly.
- provided you
, with zinc or other platings.
Angus McGill
Regulatory Engineer
Cascade Engineering Services, Inc.
ang...@cascade-eng.com
From: Robert Johnson
To: 'Kim Flint'; emc-p...@majordomo.ieee.org
Sent: 2/11/03 8:28 PM
Subject: RE: best screw/washer choices for attaching PCB to Chassis?
The product I'm referring
[mailto:john...@itesafety.com]
Sent: Monday, February 10, 2003 8:09 PM
To: Kim Flint; emc-p...@majordomo.ieee.org
Subject: RE: best screw/washer choices for attaching PCB to Chassis?
You should not include the PWB as part of the sandwich in an electrical
connection. It gradually squashes and leaves a loose
...@itesafety.com]
Sent: Monday, February 10, 2003 8:09 PM
To: Kim Flint; emc-p...@majordomo.ieee.org
Subject: RE: best screw/washer choices for attaching PCB to Chassis?
You should not include the PWB as part of the sandwich in an electrical
connection. It gradually squashes and leaves a loose
Kim,
Screw/Washer choice:
- should a washer be used or not? ONE COMPANY I WORKED FOR USED SCREWS WITH
INTEGRAL STAR WASHERS. WE NEVER HAD ONE WORK LOOSE EVEN IN MOBILE
APPLICATIONS.
- Is an adhesive like Loctite a reasonable alternative to lock washers in
this case? I WOULD THINK LOCKTITE WOULD
Kim,
Here's how I would do it. Note that I'm assuming that we're dealing
with SELV circuits here and your concern is SI/EMC on circuit packs for
a shelf system. Safety grounding is another issue entirely.
First screws:
I'd use split washers with flat beneath (if lock washers at all) to
Of Kim Flint
Sent: Monday, February 10, 2003 9:15 PM
To: emc-p...@majordomo.ieee.org
Subject: best screw/washer choices for attaching PCB to Chassis?
Hi-
We have a fairly straightforward requirement of mounting a PCB into a steel
chassis. The chassis has PEM type standoffs and the PCB is held
-Original Message-
From: Kim Flint [mailto:kfl...@inkra.com]
Sent: Monday, February 10, 2003 6:15 PM
To: emc-p...@majordomo.ieee.org
Subject: best screw/washer choices for attaching PCB to Chassis?
Hi-
We have a fairly straightforward requirement of mounting a PCB
into a steel
Kim, you ask some interesting and well thought out questions. I'm sure you
will get a lot of diverse opinions. You have entered into the domain of system
grounding. System grounding may be governed by a number of codes, such as NEC,
UL, and CSE for the North American continent. A lot more for
Hi-
We have a fairly straightforward requirement of mounting a PCB into a steel
chassis. The chassis has PEM type standoffs and the PCB is held to them with
machine screws. These connections provide an electrical ground path between
the PCB and the chassis.
In other words, we have what seems
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