DIN V VDE V 0109-2:2010 Maintenance of installations and equipment of electrical energy supply networks - Part 2: Determination of the condition of equipment/installations
2014DIN VDE V 0109-2:2014 Maintenance of installations and equipment of electrical energy supply networks - Part 2: Determination of the condition of equipment/installation
2010DIN V VDE V 0109-2:2010 Maintenance of installations and equipment of electrical energy supply networks - Part 2: Determination of the condition of equipment/installations