¿Cuál de los siguientes artículos abarca los equipos intrínsecamente seguros?

a. NEC® Artículo 502
b. NEC® Artículo 503
c. NEC® Artículo 504
d. NEC® Artículo 501


c. NEC® Artículo 504

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As a typical example of a bar mark number assigned to a reinforcing bar shown on poured-in-place concrete drawings, 4A1 indicates ____.

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