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Fitting an uncertified lock or a lock that is not certified in the correct class for a particular grade of safe or vault will invalidate the unit's certification.

Below is chart illustrating European lock certification standards. The chart outlines the number and type of locks that must be used with various grades of safes and vaults in order for certification to be maintained.

Burglary Resistance Grade (as per EN 1143-1)

Lock Configuration as per EN 1300 Number of Locks, Lock Class

Safe or Vault Grade Number Of Locks Required Lock Class Per EN1300
0 1 A
I 1 A
II 1 A
III 1 B
IV 2 B
V 2 B
VI 2 C
VII 2 C
VIII 2 C
IX 2 C
X 2 C
XI 2 (3) D (C)
XII 2 (3) D (C)
XIII 3 D