FAT procedure for LV switchboards

Factory Acceptance Test (FAT) procedure

Visual Inspection Test

Visual inspection with customer will be carried out on the LV switchboard to:

• Check the layout of fitted components
• Check the over all dimension of switchboard, size of busbars, cables and earthing conductors and location of feeder entry point.
• Check and verify the brand, model, and circuit identification of components installed such as breakers, current transformers, fuses, ammeters, voltmeters, power meters and protection relays etc.
• Check overall paint work, door locking device, door gasket, door hinges, door cut-out holes
• Check the busbar and cable tightening, the marking, busbar clearance, base angle bar and plinth
• Check the labels, name plate and phase identification

Insulation Test

Carry out 500V Megger test for phase to earth, neutral to earth, phase to neutral and phase to phase to measure the insulation resistance with all breakers in ‘ON’ positions.

High Voltage Injection Test

Carry out 500V Megger test between each stressed phase and all other phase connected to exposed conductive parts with all breakers in ‘ON’ positions.

Apply 2.5kV AC voltage between each stressed phase and all other phase connected to exposed conductive parts for 60 seconds and measure the leakage current.