ANSI/ESD S20.20 Comparison
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| Significant Changes made from the 1999 version to the 2007 version of S20.20 |
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| 1. All of the guidance sections were removed to avoid confusion with actual requirements. The Guidance information can be found in TR20.20.
| 1999 |
2007 |
| Section 6.0.2 - ESD Control Program Guidance |
Removed |
| Section 6.1.1.2 - ESD Control Program Plan Guidance |
Removed |
| Section 6.1.2.2 - Training Plan Guidance |
Removed |
| Section 6.1.3.2 - Compliance Verification Plan Guidance |
Removed |
| Section 6.2.1.2 - Grounding / Bonding Systems Guidance |
Removed |
| Section 6.2.2.2 - Personnel Grounding Guidance |
Removed |
| Section 6.2.3.2 - Protected Areas Guidance |
Removed |
| Section 6.2.4.2 - Packaging Guidance |
Removed |
| Section 6.2.7.2 - Handling Procedure Guidance |
Removed |
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| 2. The limits in the 20.20 standard were changed from recommended in the 1999 version to required limits in the 2007 version. The limits themselves did not change at all. See samples below. |
| A sample from Table 2 in the 1999 version |
| Implementing Process or Method |
Recommended Range |
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|
| Work Surface |
< 1 X 10e9 ohm |
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< 200 Volts |
| Wrist Strap Cord |
0.8 X 10e6 to |
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1.2 X 10e6 ohm |
| Footwear |
< 1 X 10e9 ohm |
| Flooring |
< 1 X 10e9 ohm |
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| A sample from Table 3 in the 2007 version |
| ESD Control Item |
Required Limit(s) |
| Worksurface |
< 1 x 10e9 ohms |
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and/or |
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< 200 volts |
| Wrist Strap Cord |
0.8 x 10e6 to |
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1.2 x 10e6 ohms |
| Footwear |
< 1 x 10e9 ohms |
| Flooring |
< 1 x 10e9 ohms |
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3. The reference to TR53 was added to the 2007 version of S20.20.
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| 1999 |
| Did not have a reference to the TR53 document. |
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| 2007 |
| Compliance Verification |
| Test Method |
Required Limit(s) |
| ESD TR53 |
< 3.5 x 10e7 ohms |
| Wrist Strap Section |
| ESD TR53 |
< 3.5 x 10e7 ohms |
| Flooring Section |
| ESD TR53 |
< 3.5 x 10e7 ohms |
| Footwear Section |
| ESD TR53 Flooring Section |
< 1.0 x 10e9 ohms |
| ESD TR53 Footwear Section |
< 1.0 x 10e9 ohms |
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| 4. The reference to humidity controls has been eliminated in the 2007 version of S20.20. |
| A sample from Table 1 in the 1999 version |
| Implementing Process or Method |
Area 1 |
Area 2 |
Test Method, Standard or Advisory |
Recommended Range |
| Mfg. |
Field |
| Humidity |
O |
O |
N/A |
> 30% Rh <70 % |
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| 5. The requirement of product qualification was added to the 2007 version of S20.20. This requires that items brought into a compliance process be tested to ESD Association standards to ensure that products will perform as intended. |
1999 |
There was no product qualification requirement. |
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|
| A sample from Table 3 in the 2007 version |
| ESD Control Item |
Product Qualification |
| Test Method |
Required Limit(s) |
| Worksurface |
ANSI/ESD S 4.1 |
< 1 x 10e9 ohms |
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and/or |
and/or |
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ANSI/ESD STM 4.2 |
< 200 volts |
| Wrist Strap Cord |
ANSI/ESD S1.1 |
0.8 x 10e6 to |
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|
1.2 x 10e6 ohms |
| Footwear |
ANSI/ESD STM9.1 |
< 1 x 10e9 ohms |
| Flooring |
ANSI/ESD S7.1 |
< 1 x 10e9 ohms |
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| 6. The tables were reformatted and separated for clarity. |
| A section from Table 1 in the 1999 version |
| Technical Requirement |
Reference Paragraph |
Implementing Process or Method |
Area 1 |
Area 2 |
Test Method, Standard or Advisory |
Recommended Range |
| Mfg. |
Field |
| Personnel Ground |
6.2.2 |
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Wrist Strap System |
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ESD S1.1 |
< 35 X 10e6 ohm |
| Seated Operations |
R |
R |
| Standing Operations |
O |
O |
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Flooring – Footwear System |
O |
O |
ESD STM 97.1 |
< 35 X 10e6 ohm |
| or |
or |
| ESD STM 97.2 |
< 100 Volts |
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| The new Table 2 in the 2007 version |
| Personnel Grounding Technical Requirement |
Product Qualification |
Compliance Verification |
| Test Method |
Required Limit(s) |
Test Method |
Required Limit(s) |
| Wrist Strap System |
ANSI/ESD S1.1 (Section 5.11) |
< 3.5 x 10e7 ohms |
ESD TR53 |
< 3.5 x 10e7 ohms |
| Wrist Strap Section |
| Flooring / Footwear System – Method 1 |
ANSI/ESD STM97.1 |
< 3.5 x 10e7 ohms |
ESD TR53 |
< 3.5 x 10e7 ohms |
| Flooring Section |
| ESD TR53 |
< 3.5 x 10e7 ohms |
| Footwear Section |
| Flooring / Footwear System – Method 2 |
ANSI/ESD STM97.1 |
< 10e9 ohms |
ESD TR53 Flooring Section |
< 1.0 x 10e9 ohms |
| (both required) |
ANSI/ESD STM97.2 |
< 100 volts |
ESD TR53 Footwear Section |
< 1.0 x 10e9 ohms |
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| 7. The 2007 version of S20.20 now allows for three different kinds of grounding / bonding. |
| A section from Table 1 in the 1999 version |
| Technical Requirement |
Reference Paragraph |
Implementing Process or Method |
Area 1 |
Area 2 |
Test Method, Standard or Advisory |
Recommended Range |
| Mfg. |
Field |
| Grounding / Bonding Systems |
6.2.1 |
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ANSI EOS/ |
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| ESD S 6.1 |
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Equipment Ground |
R |
O |
ANSI EOS/ |
< 1.0 ohm |
| ESD S 6.1 |
AC Impedance |
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Auxiliary Ground |
O |
O |
ANSI EOS/ |
< 1.0 ohm |
| ESD S 6.1 |
AC Impedance |
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Equipotential Bonding |
O |
O |
ESD ADV 2.0 |
< 1.0 X 10e9 ohm |
| Section 13 |
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Common Point Ground |
R |
O |
ANSI EOS/ |
< 1.0 ohm |
| ESD S 6.1 |
AC Impedance |
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| The new Table 1 in the 2007 version |
| Technical Requirement |
Implementing Process |
Test Method |
Required Limit(s) |
| Grounding / Bonding System |
Equipment Grounding Conductor |
ANSI/ESD S6.1 |
< 1.0 ohm impedance |
| Auxiliary Ground |
ANSI/ESD S6.1 |
< 25 ohms to the Equipment Grounding Conductor |
| Equipotential Bonding |
ANSI/ESD S6.1 |
< 1.0 x 10e9 ohms |
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| 8. There is now a requirement to name an ESD coordinator in the 2007 version of S20.20. |
1999 |
There was no requirement to name an ESD coordinator. |
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| 2007 |
| 6.2 ESD Control Program Manager or Coordinator |
| An ESD Control Program Manager or Coordinator shall be assigned by the Organization to verify the compliance of the Program in accordance with the requirements of this document. |
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