296-32-23526  <<  296-32-23528 >>   296-32-23530

WAC 296-32-23528

Manholes, street openings and vaults.

(1) Guarding manholes and street openings.
(a) When covers of manholes or vaults are removed, the opening shall be promptly guarded by a railing, temporary cover, or other acceptable temporary barrier to prevent an accidental fall through the opening and to protect employees working in the manhole from foreign objects entering the manhole.
(b) When work is to be performed on underground plant, the immediate foreman in charge and/or the craftsman assigned to do the work shall make a complete job hazard assessment of the work location in regard to the hazards that are created or that could exist prior to beginning the work in underground plant.
(c) The immediate foreman and/or the craftsman responsible for the job completion shall be in agreement of the proper method of eliminating or reducing any hazards that are present or could be caused by the location of the worksite, before the job proceeds.
(2) Requirements prior to entry of manholes and unvented vaults.
(a) The internal atmosphere shall be tested for oxygen deficiency and combustible gas.
(b) Mechanical forced air ventilation shall be in operation at all times when employees are required to be in the manhole.
(c) The mechanical forced air equipment provided shall be of a quantity to replace the exhausted air and shall be tempered when necessary.
(d) Ventilation equipment shall be designed in such a manner that employees will not be subjected to excessive air velocities.
Note:
For additional requirements relating to confined spaces see chapter 296-809 WAC.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060, and chapter 49.17 RCW. WSR 17-20-069, ยง 296-32-23528, filed 10/2/17, effective 1/1/18.]
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