Colores y signos distintivos del sentido rotacional de fases en corriente alterna y polaridades en corriente continua.
DISTINCTIVE SIGNS AND COLOURS OF ALTERNATING CURRENT PHASE AND DIRECT CURRENT POLARITY ROTATIONAL SENSE.
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01.070 / Colour coding
29.020 / Electrical engineering in general
CTN 200/SC 16 - Basic and safety principles for man-machine interface, marking and identification
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