2016DIN EN ISO 80079-37:2016 Explosive atmospheres - Part 37: Non-electrical equipment for explosive atmospheres - Non-electrical type of protection constructional safety "c", control of ignition sources "b", liquid immersion "k" (ISO 80079-37:2016); German version EN ISO 80079-37:20
2011DIN EN 13463-5:2011 Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety 'c'; German version EN 13463-5:2011
2004DIN EN 13463-5:2004 Non-electrical devices for use in potentially explosive areas – Part 5: Protection through constructive safety “c”