>From my experience, one does not require a grounding resistor on table mats / floor mats. In fact, I've connected them directly into earth ground. According to EIA-625, Figure 1 (page 8), the resistors for the static dissipative work surfaces (R2) and the ESD protective floor mats (R3) are optional. If you are using R2 and R3, the values should be specified by the ESD equipment manufacturer. I don't think there are any special requirements (wattage, material of construction, etc.) for this resistor. Lee Whiteman Senior Manufacturing Engineer ACI / EMPF Telephone: (610) 362-1200; Ext. 208 FAX: (610) 362-1290 E-Mail: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ashok Dhawan Sent: Tuesday, May 23, 2000 6:51 PM To: [log in to unmask] Subject: [TN] Question on EIA-625 : Technical specs of Grounding resistor << File: adhawan.vcf >> For grounding Table Mats/ Floor Mats and workstations, does grounding resistor need special characteristics e.g. Wattage, material of construction, etc. We intend to use 1M Ohms resistor. EIA-625 does refer to EOS/ESD-S6.1 standard ( paragraph 7) for grounding details, if anyone has that details on that. Thanks in advance for advice. Ashok -- Ashok Dhawan P.Eng Engineering C-Mac Electronic Systems Inc. 1455 Mountain Avenue Winnipeg, Manitoba R2X 2Y9 Canada Phone: (204) 631-7208 Fax: (204) 631-7294 E-mail: [log in to unmask] www.cmac.ca ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################