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Extra resources for Electric Power Distribution Systems (ch320)
They admit either three-prong grounded plugs or two-prong plugs. Only two-prong plugs attached to double insulated, portable, plastic, electrical equipment (such as shavers, erasers, drills, grinders, and sanders) are permitted in these receptacles on board ship. Double insulated housings do not require grounding for personnel safety. b. Single, 120V, 15-ampere, single-phase ac or two-wire DC, watertight, bladed-type receptacles. They are used on radar platforms, close in weapons system mounts, open bridges, and other weather deck locations with electronic test equipment and portable tools.
Electrical operation allows the circuit breaker to be used for remote control operation as well as for protection. ACB circuit breakers are commonly used to connect ship service and emergency generators to the power distribution system. They are also used on bus ties, some shore power connection circuits, and some larger feeder circuits. 2 AQB Type. AQB circuit breakers are in a supporting and enclosing housing of insulating material with direct-acting automatic tripping devices. They are used to protect most switchboard, load center, and distribution panel circuits where the maximum available short circuit current is within the interrupting rating of an AQB breaker.
E. Personnel preparing drills and engaged in drills should know which equipment (such as electronic equipment) might be damaged by unexpected power interruptions. Damage might occur because power to cooling equipment is interrupted while heat-sensitive electronic equipment is still operating or has had no chance to cool down.