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 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 Ω	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 oft he 5 highest peaks)	IEC 61340-4-5	Rg < 1,0 x 109 Ωd, 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.