Fuji Electric FRENIC-HVAC Manual page 86

If it is difficult to punch semi-perforated sections out of the wiring plate
Apply a rod with a sharp tip (e.g., chisel) to point "A" shown below and tap it using a hammer.
Hammer or
the like
Connections
"A"
Chisel or
the like
Block or the like
Wiring plate
Take care not to deform the wiring plate.
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