Requirements for personal grounding according to DIN EN 61340-5-1
Carrying out correct personal grounding
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ESD insights

Requirements for personal 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
Inside
Outside
-
<= 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
Footwear
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 61340-5-1
Rg < 1 x 109 Ωd,f
System
Person/footwear
Not applicable
-
Rgp < 1 x 108 Ω

Legend to the table

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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