relays

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1. General Safety Precautions
Safety devices such as interlocks, overload relays, and fuses should never be altered or disconnected except for replacements. Safety or protective devices should never be changed or modified in any way without specific authorization.
http://www.fun-home-projects.com/electrical_projects/​general_safety_precautions.html

2. Setback Thermostats
Low-voltage thermostats work in conjunction with various relays and valves such as oil burner relays, pump relays and zone controls.
http://www.fun-home-projects.com/home_ownership/​energy_economics/​setback_thermostats.html

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