Grass Valley Safety Summary - Manual (Page 16)

Work Surfaces
Painted or vinyl-covered tables, chairs, conveyor belts, racks, carts, anodized surfaces, plexiglass
covers, and shelving are all static generators.
Equipment
Any equipment commonly found in an ESD work area, such as solder guns, heat guns, blowers,
etc., should be grounded.
Materials
Plastic work holders, foam, plastic tote boxes, pens, packaging containers and other items commonly
found at workstations can generate static electricity.
Grounding Requirements for Personnel
The information in this section is provided to assist you in selecting a grounding method. This
information is taken from ANSI/ESD S20.20-2007 (Revision of ANSI/ESD S20.20-1999).
Product Qualification
Required Limits Test Method Personnel Grounding Technical
Requirement
< 3.5 x 10
7
ohm ANSI/ESD S1.1 (Section 5.11) Wrist Strap System*
< 3.5 x 10
7
ohm ANSI/ESD STM97.1 Flooring / Footwear System –
Method 1
< 10
9
ohm ANSI/ESD STM97.
1ANSI/ESD STM97.2 Flooring / Footwear System –
Method 2 (both required)
< 100 V ANSI/ESD STM97.2
Product qualification is normally conducted during the initial selection of ESD control products and
materials. Any of the following methods can be used: product specification review, independent
laboratory evaluation, or internal laboratory evaluation.
Compliance Verification
Required Limits Test Method Personnel Grounding Technical
Requirement
< 3.5 x 10
7
ohm ESD TR53 Wrist Strap Section Wrist Strap System*
< 3.5 x 10
7
ohm ESD TR53 Flooring Section and
ESD TR53 Footwear Section Flooring / Footwear System –
Method 1
< 1.0 x 10
9
ohm ESD TR53 Flooring Section and
ESD TR53 Footwear Section Flooring / Footwear System –
Method 2 (both required)
* For situations where an ESD garment is used as part of the wrist strap grounding path, the total
system resistance, including the person, garment, and grounding cord, must be less than 3.5 x 10
7
ohm.
16 Safety Summary 21 January 2013
ESD Protection