Reminds me of the time when I worked with high voltage equipments. The simple and basic rule was 'work with one hand on the tool and the other in the pocket' . Sounds odd for today's low voltage people, but that rule saved many from accidents.
/Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: måndag 22 mars 2010 16:21
To: [log in to unmask]
Subject: Re: [TN] ESD protection / high voltage safety question
I also agree w/ Rex.
Anytime products are under test with high voltages there should be adequate protection. One way to accomplish this is through interlocks that disable the voltage source if broken. This is probably standard feature of any high voltage tester.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: Monday, March 22, 2010 3:32 AM
To: [log in to unmask]
Subject: Re: [TN] ESD protection / high voltage safety question
I disagree with the approach taken by the feedback you have received.
The ESD requirements are nothing to do with your problem.
To me your problem is that you are admitting there is a risk of electrocution in your work place and that is the problem you must address.
At 20kV it seems to me that this carries the risk of death (with or without wrist straps) and therefore your risk analysis and work procedures should reduce this risk to zero. If not you are effectively planning to kill someone.
Once you have done that risk analysis and altered your work procedures to make it safe then wearing heel straps or wrist straps should be neither here or there.
The only reason that I can think that it might not be OK to wear heel grounders or wrist straps is if you decide that contact with live parts is likely and therefore the operators must wear rubber gloves, rubber boots of a suitable rating etc.
I have operators in my ESD area who wear leather shoes and pass the ESD footware tests every day. Your approach would mean having to replace those shoes. The benches in my ESD area are earthed, so a risk of touching something live and the bench is there with or without wrist straps.
We do Hi-Pot tests in our ESD area, the operators wear their standard ESD heel grounders and wrist straps. The whole process has been risk assessed and is considered safe.
If your work procedures are correct then the work environment should be safe, with or without ESD precautions.
Regards
Rex
-----Original Message-----
From: TechNet on behalf of Graham Collins
Sent: Fri 3/19/2010 1:33 PM
To: [log in to unmask]
Subject: [TN] ESD protection / high voltage safety question
Hello TechNet
A question for you guys concerning ESD protection and it's interaction
(conflict) with safety.
We use the standard wrist strap and cord with the built in resistor, and practice that any time an ESD sensitive assembly is being worked on we have to wear the wrist strap. This is fine in the production environment, but in test we can be dealing with some scary voltages, and being nicely grounded is not necessarily a good thing. Say for example, when working with something that has up to 20,000 v DC running through it.
What are other folks doing in cases like this?
My first instinct is that our rule should be modified to say that the wrist strap is not to be used if voltages in excess of 250v are present.
regards,
Graham Collins
Halifax Production Engineering
L-3 communications Electronic Systems
(902) 873-2000 ext. 6215
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