I need this Radio Shack transformer to provide power to a HO scale model train board lighting system. This transformer will be connected to a brightness control system and then the brightness control system will be connected to building lights and street lights. I have been told this issue is a safety and Electrical Code concern?
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Tying the neutral to ground gives the system a reference point. Your system will then be protected against earth faults which would allow circuit fuses to blow to protect each sub-circuit should an earth fault develop. Without the neutral earth connection an earth fault on a given sub circuit would not result in a fuse blowing / breaker tripping thereby potentially causing associated metalwork to reach dangerously high potential and possible danger of electric shock should a person happen to touch the live metalwork and live parts at the same time.