General > General Technical Chat
ESD mats - when is grounding not required?
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jh15:
It is Ufer earthing or grounding method.
tkamiya:
You are right!  I always mess this one up.  Appreciate your correction.

The point I wanted to make was, during construction, rebar can be welded and portion of it exposed.  ("inspectable" is a requirement for this type of ground)  In that case, it can be used as a ground for mains.
SilverSolder:

Ufer madness?  :D
DanielMilkov:

- His view is that connecting to ground is not required as it is so big that it should dissipate constantly.
- My view is that BSEN 61340-5-1 clearly states that flooring system needs to be attached to the common ground point. I've never heard of the argument of large mats not requiring grounding.

If you are working with sensitive devices its always a good idea to ground the whole mat just in case becouse dust/residue on the surface could compromise its electrical properties.You can also attenuate its properties by dragging heavy objects over the surface, abrasion or cuts, chemical cleaners, or direct heat caused by soldering or rework.I personally always keep my matt grounded and wear a wrist strap only in extreme cases.But overall these wrist straps are a big pain.And i avoid them as often as i can.But I always keep my matt grounded just in case I work on something more sensitive.

You can read the artical here : https://blog.gotopac.com/2017/09/06/do-you-need-a-esd-worksurface-mat-if-your-workstation-has-esd-laminate-do-you-need-an-esd-chair-if-you-have-an-esd-floormat/
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