Approval/Certificate/Document of Conformity
IECEx Certificate 
of Conformity 
Certificate No.:  IECEx ULD 14.0005U 
  Issue No.:6  
  Page 4 of 4 
MARKING 
This is an example of WDU 4/ZR. For the other types see the respective drawings. 
ROUTINE EXAMINATIONS AND TESTS 
According to IEC 60079-7 clause 7.1 in combination with clause 6.1 a dielectric strength test has to be carried 
out. The routine tests may be performed on a statistical basis according to ISO 2859-1 with an acceptance 
quality limit (AQL) of 0,04. Routine test is to be carried out according to Weidmuller procedure “High voltage 
test” Document -NR: A_10_54. 








