When working with explosion proof equipment in hazardous locations, proper connections and sealing of openings are critical for safety. What is a necessary aspect of these connections, and what mistake compromises the equipment's integrity? Group of answer choices Threaded connections must be wrench-tight with a sufficient number of engaged threads Connections must be hand-tightened only to avoid damage; A mistake is using any tools to tighten them. Threaded entries are only for convenience in pulling wires; A mistake is using standard pipe dope. Unused openings can be left open for ventilation; A mistake is closing them with non-metallic plugs