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#31232 - 11/14/03 10:11 AM How dangerous is this?
SvenNYC Offline
Member

Registered: 08/19/02
Posts: 1685
Loc: 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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#31233 - 11/14/03 10:39 AM Re: How dangerous is this?
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
Loc: 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).]

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

Broom Pusher and
Member

Registered: 10/19/00
Posts: 2724
Loc: 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! ...hee hee hee)

Just make sure yours has a high Resistance too!

Scott35
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

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#31235 - 11/14/03 03:11 PM Re: How dangerous is this?
SvenNYC Offline
Member

Registered: 08/19/02
Posts: 1685
Loc: 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.

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#31236 - 11/15/03 10:30 AM Re: How dangerous is this?
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: 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.

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#31237 - 11/15/03 08:03 PM Re: How dangerous is this?
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: 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.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

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