The aperture should be larger.
The hole diameter for installing the wall bushing should be more than 5mm larger than the embedded parts, and the maximum thickness of the concrete mounting plate should not exceed 50 mm.
Avoid closing the magnetic circuit
When the rated current 1500A or above is directly fixed on the steel plate, a closed magnetic circuit should not be formed around the sleeve.
Flange installation direction
When the wall bushing is installed vertically, the flange should face upwards, and when it is installed horizontally, the flange should face outwards.
Metal splint should be qualified.
The metal splint (except fasteners) at the end of the bus-bar wall bushing of 600A and above shall be made of non-magnetic materials, which shall be connected with the bus-bar through metal, and the contact shall be stable. The thickness of the metal splint shall not be less than 3 mm. When there are two or more buses, the bus itself should be fixed.
Pay attention to the oil-filled shell
When the oil-filled casing is installed horizontally, there should be no leakage in the oil storage tank and oil sample pipeline, the oil level indication should be clear, the oil-filled and sampling valves should be installed on the patrol monitoring side, and the oil injected into the casing must be qualified.
Grounding terminal should be reliable.
Bushing grounding terminal and unused voltage lead-out terminal shall be reliably grounded.