How to wire TUNNEL Wiring Circuit - TAGALOG

Tunnel wiring circuit is used in open ended corridors and short tunnels like structures. In tunnel wring circuit diagram, we have used SPDT (three-way) switches to control the lighting points in tunnels and corridors. The tunnel circuit control the lamps in four ways as follow.
During normal light in the day from 7AM to 6PM, only the middle one bulb will glow and the first and last one will turned OFF. At night, the first and last one will glow while the middle one will OFF. During high traffic, all the three bulbs will turn ON. During maintenance or special operations, the circuit will work like godown circuit one by one lamp will turn ON in the sequence.
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