Most electrical outlets have a prong that connects to the earth ground, which is also usually wired into the building electrical system for safety.
绝大多数电源插座有一个地线端与大地相连，这通常是为保障建筑电气系统的安全而采取的安全措施。
Pre-wired and tested controls which include control circuit, high and low pressure safety switches, 24 volt control circuit, flow switch & ETL Listed.
预有线和测试控制，包括控制电路，高低压安全开关，24伏的控制电路，流量开关。
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