Mitsubishi Electric MELDAS 600 Series Connection Manual page 139

(2) Surge absorber installation method
Earth leakage
From power
breaker for
supply panel
Input
200/
230VAC
Grounding
Grounding plate
Precautions
1) Thick wires will enhance the lighting surge absorption effect, so keep the wire as short as possible.
Wire material : Wire diameter
Wire length
2) When carrying out a withstand voltage test, while applying an overvoltage (100VAC, 1500VAC) on
the power supply line, remove surge absorbers (2) as the surge absorber will function with the applied
voltage.
3) A short-circuit accident will occur if a surge exceeding the tolerance is applied on the surge absorber.
Thus, always insert a circuit protector to protect the power supply line.
The current does not flow constantly to surge absorbers (1) and (2), so the circuit protector can also
be used for the other devices.
APPENDIX 3 EMC INSTALLATION GUIDELINES
6. Parts for EMC Measures
Transformer
No-fuse
breaker
MCC
Ａ
Surge absorber (1)
Circuit
protector
Surge absorber (2)
Ｂ
Surge absorber installation method
2
2mm or more
Connection length (A) to surge absorber (1) is 2m or less.
Connection length (B) to surge absorber (2) is 2m or less.
No-fuse
breaker
NC control
section
Other device
(power supply
for panel, etc.)
Reactor
NC control
section
Other device
(power supply
for panel, etc.)
133
Control panel
(relay panel,
etc.)