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ELECTRICAL PLAN SYMBOLS ELECTRICAL ONE-LINE SYMBOLS ...· PDF file2 = double pole switch 3 = three-way switch 4 = four-way switch k = key operated switch f = switch and fusestat holder p = switch and pilot light t = thermostat d = dimmer switch l = low voltage light switch m = manual motor starter single pole switch b = device switched designation = circuit designation occupancy sensor a = circuit designation

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