Profile		Standard	Fog type	Fog type
IEC-standard		U40B		U40BP
Factory-standard			U40M
Standard coupling, d	mm	11	11	11
Mechanical failing load	kN	40	40	40
Mechanical routine test	kN	20	20	20
Diameter of the insulating part, D	mm	178	255	178
Nominal Spacing, H	mm	110	110	110
Nominal creepage distance	mm	190	320	300
Power frequency puncture voltage	kV	90	110	110
power frequency withstand voltage - dry	kV	55	70	60
power frequency withstand voltage - wet	kV	30	40	34
Impulse puncture voltage	P.U	2.8	2.8	2.8
Radio influence voltage 10kV 1MHz	μv	50	50	50
Corona visual test	kV	18/22	18/22	18/22
Power frequency electric arc voltage	ka	0.12s/20kA	0.12s/20kA	0.12s/20kA
Weight	kg	2.1	3	2.5
All technical requirements and testing are in accordance with IEC standards.