The CD designation stands for Core Drilling and is an optional addition to the grade under EN 1143-1, just like EX or T2. A core drill is a powerful drilling machine fitted with a diamond-tipped bit, capable of penetrating even reinforced concrete. In the CD test, the product is attacked at length with this equipment: a safe with the CD option must delay the attack as long as possible, while a strongroom or strongroom door with the CD option must be able to stop it altogether. Products that pass this test carry the CD marking after their grade on the certification plate, for example Grade IX CD.
In our range, the Chubbsafes TriForce T2 can optionally be fitted with Core Drill protection, and the Wertheim vault rooms and vault doors are certified with the CD designation up to the highest grades. To see why this option is more than theory, read our article on core drill protection for safes and vault doors.