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How dangerous is this? #31232
11/14/03 01:11 PM
11/14/03 01:11 PM
S
SvenNYC  Offline OP
Member
Joined: Aug 2002
Posts: 1,691
New York City
I've got this wrist-grounding strap (a conductive strip of material with a wire and an alligator clip attached) that I use for grounding myself when I'm working on some solid-state stuff on my workbench (like replacing a card on a computer or diddling with an electronic clock radio).

Anyway....since I have a grounded socket strip on my workbench, how safe would it be to attach the wire of my grounding strap the the ground pin of an old male plug and then stick that sucker into the socket? Assume socket is wired correctly I'm assuming no problem....but still.

Usually I just clamp the thing to the metal casing of the power strip...but clip pops off sometimes....

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Re: How dangerous is this? #31233
11/14/03 01:39 PM
11/14/03 01:39 PM
N
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
That's what I do with mine, with no problems. And I have seen grounding straps (3M, IIRC) provided with a plug intended for this purpose. The plug had 2 plastic blades and a metal ground pin. I would be a bit leary about using a setup like that out in the field, where the wiring/grounding integrity of the outlets is unknown, though.

For safety, a wrist strap MUST incorporate a high value of resistance (usually 1 megohm) in series with it, so you aren't making a direct connection to earth ground anyway. Just enough of a path to drain away static charges.

[This message has been edited by NJwirenut (edited 11-14-2003).]

Re: How dangerous is this? #31234
11/14/03 06:03 PM
11/14/03 06:03 PM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Like NJWirenut said, most Grounding Wrist Straps for draining / eliminating ESD have a 1 Megaohm Resistor in series, so the user doesn't become a conductor.
(not a train conductor! [Linked Image]...hee hee hee)

Just make sure yours has a high Resistance too!

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: How dangerous is this? #31235
11/14/03 06:11 PM
11/14/03 06:11 PM
S
SvenNYC  Offline OP
Member
Joined: Aug 2002
Posts: 1,691
New York City
Thanks guys!!

Yes, this little strap does have the resistor spliced in series with the strap and the wire.

I don't plan on using this anywhere but my own bench. That way I KNOW what I'm plugging it into. [Linked Image]

Re: How dangerous is this? #31236
11/15/03 01:30 PM
11/15/03 01:30 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
I use of on those when working on MOS devices too. As the others have said, the high value resistance in series is an essential guard to your safety if you did ever accidentally touch an energized part with your other hand.

I have a regular banana plug on mine which will fit the grounding posts on many items of test equipment. It fits just nice in the ground hole of the NEMA 120V receptacles on a power strip too.

Re: How dangerous is this? #31237
11/15/03 11:03 PM
11/15/03 11:03 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
My part of the workshop at work has an ESD safety area in it, with a big grounded safety mat, strap and multiple bonding points on it as well as an ESD safe Soldering Station.
You just can't be too careful with Electronic Equipment.
I've seen really expensive controllers ruined by idiots that don't take the simple precaution of wearing a static strap. [Linked Image]


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