Requirements for personnel grounding according to DIN EN 61340-5-1

ESD Control element Product qualification Verification of compliance
Test method Thresholdsb Based on test method Thresholdsb

Wrist straps (straps and grounding cable)
IEC 61340-4-6 R < 5 x 106 Ω 
or user-defined threshold
See wrist strap system

Resistance of the
wrist strap
IEC 61340-4-6
<= 1 x 108 Ω 
<= 1 x 107 Ω 
Not applicable
Not applicable
Wrist strap systema 
Not applicable
IEC 61340-4-6
Testing the electrical connection of the
wrist strap
R < 3,5 x 107 Ω

IEC 61340-4-3c R <= 1 x 108 Ωe  See system Person/footwear
System Person/footwear/floor
IEC 61340-4-5
Rg < 1 x 109 Ω 
and absolute value of body voltage
< 100 V (average of the 5 highest peaks)
IEC 61340-4-5  Rg < 1,0 x 109d, f
System Person/footwear
Not applicable
- Rgp < 1,0 x 108 Ω

a In situations where EPA clothing (according to IEC 61340-4-9) is used as part of the wrist strap grounding path, the resistance of the complete system should be including person, protective clothing and grounding cable should be < 3.5 x 107 Ω.
b Symbols used in this table: Rg corresponds to resistance to ground and Rgp refers to resistance to groundable point.
c For the product qualification of footwear according to IEC 61340-4-3, the environmental conditions for the test should be (12 ± 3) % relative humidity and (23 ± 2) °C.
d A periodic test of the generated body voltage should be performed to verify that the voltage is less than 100 V.
e The threshold of the resistance applies to the successive measurement of a single foot at a time, not both feet at the same time.
f The required threshold of  <1.0 x 109 Ω is the highest allowable value. The user should set an upper limit based on the resistance values measured for the product qualification of the footwear and floor system which ensure a maximum generated body voltage of 100 V, and use these resistance values for the verification of compliance.


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