A "permit-required confined space" in construction is one that:
Explanation
Section 5157(b) defines a confined space as one large enough to enter and perform assigned work, with limited or restricted means of entry or exit, and not designed for continuous employee occupancy - which is option (c). That is true of every permit-required space and is not what adds the permit. The permit is added by one or more of four conditions: a hazardous atmosphere or the potential for one, a material with the potential for engulfment, an internal configuration that could trap or asphyxiate through inwardly converging walls or a floor sloping to a smaller cross-section, or any other recognised serious safety or health hazard. Neither the size of the opening (b) nor the depth (d) appears in either definition.
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