SR-48006 - Doors and panels shall be hinged. There shall be isolating bars behind the doors. The bars shall be coloured yellow and black (zebra stripes) if not otherwise required by national regulation.SR-47936 - Liquid filled units shall be equipped with man holes to perform access to OLTC, bushings and other internal inspection points if relevant.SR-47958 - For plug-in type bushing or equivalent touch proof solution, a portable earthing device shall be delivered, if not otherwise stated.SR-47959 - It shall be provision for measuring voltage at the bushing to be able to check if the transformer is energized.