I believe that the mat-to-floor contact should provide the necessary dissipative current-flow path.  This could be verified with the same method used to verify the performance of your floor.



Later,

Carl







Carl B. Van Wormer, P.E., AE7GD

Senior Hardware Engineer

Cipher Engineering LLC

    21195 NW Evergreen Pkwy Ste 209

    Hillsboro, OR  97124-7167

    503-617-7447x303

    [log in to unmask]     http://cipherengineering.com





-----Original Message-----

From: TechNet <[log in to unmask]> On Behalf Of James Head

Sent: Friday, August 17, 2018 2:41 PM

To: [log in to unmask]

Subject: Re: [TN] ESD



You need the 1MEG resistor. It's purpose is to dissipate the charge at a non-instantaneous rate, protecting the electronic assembly and protecting the operator.



James Head BEng MIET CID+



James Head PCB Design and Engineering

11 Charmind Walk,Winterbourne Road, SWINDON, SN25 1QA

Telephone: 01793 266237

Mobile: 07870 945579

Skype: headjames

E-mail: [log in to unmask]

Website: www.jameshead.co.uk





On Fri, 17 Aug 2018 at 21:32, Vargas, Stephen M <[log in to unmask]>

wrote:



> All:

>

>       A quick ESD question. We would like to use 3'x4' static 

> dissipated anti-fatigue mats at our SMT lines. The floor under these 

> mats are coated with ESD wax and verified regularly. The question is 

> whether the mats need to be grounded with a 1 megohm resistor or will 

> the static charge dissipate naturally through the mat into the floor? 

> Wiring is an option, but the wires tend to get damaged frequently through normal operator movement.

> Thanks in advance.

>

> Regards,

> Steve Vargas

>