Article 501 through 503 form a trilogy. Art. 505 provides an alternative to Art. 501; Art. 506 provides an alternative to Art. 502 and 503. Between these two sets is Art. 504. It’s sandwiched there ...
North American companies are beginning to move toward intrinsically-safe systems, already well established in Europe, that use currents and voltages too low to spark an explosion in a hazardous ...
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