The installation should follow the IEC Publ.52 is recommended if the spheres have a diameter < 25 will be installed in the horizontal position. If bigger is installed vertically.
The installation should be performed according to IEC Publ.52 suggested that if a sphere with a diameter <25. Is mounted horizontally If bigger is mounted vertically.
The installation should be treated as IEC Publ.52 suggested, is if the spheres are a line through the middle 25 will be installed soon array < horizontal if bigger than to be installed in vertical.