Article 300 cable or nonmetallic raceway-type wiring methods installed in a groove, to be covered by wallboard, siding paneling, carpeting, or similar finish must be protected by 1/16in.thick____ or by not less than 1 1/4in. of free space for the full length of the groove. A thinner plate that provides equal or better protection may be used if listed and marked. a. steel plate      b. steel sleeve    c. PVC bushing  d. a or b

Question

Article 300

cable or nonmetallic raceway-type wiring methods installed in a groove, to be covered by wallboard, siding paneling, carpeting, or similar finish must be protected by 1/16in.thick____ or by not less than 1 1/4in. of free space for the full length of the groove. A thinner plate that provides equal or better protection may be used if listed and marked.

a. steel plate      b. steel sleeve   

c. PVC bushing  d. a or b

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