Cuando deban sujetarse conductores en sistemas de conductos verticales, debe instalarse un soporte para cable:
a. lo más cerca posible de la parte inferior del tramo de tubería eléctrica.
b. cada 20 pies (6,10 m)
c. lo más cerca posible del centro del tramo de tubería eléctrica.
d. en la parte superior o lo más cerca posible de la parte superior del sistema de conductos.
d. en la parte superior o lo más cerca posible de la parte superior del sistema de conductos.
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