§ 33.225. Conventional hoisting in shafts.

 (a)  Over all shafts, as they are being sunk, a safe and substantial structure shall be erected to sustain the sheaves and pulleys. This structure shall be not less than 10 feet above the tipping place. Arrangements shall be made at the top of each shaft so that no material falls into the shaft while the bucket is being emptied. This structure shall be erected as soon as a substantial foundation is obtained and in no case shall a shaft be sunk to a depth of more than 50 feet without such a structure.

 (b)  If the bucket in which material is being hoisted is landed on the truck, the truck shall be constructed so that material does not fall into the shaft.

 (c)  All material elevated from shafts which are being sunk shall be raised only in a bucket. These buckets shall be connected to the cable or chain by a safety hook, clevis, or other approved attachment.

 (d)  Nothing in this subchapter shall prevent the use of buckets without guides and guide attachments in shafts being sunk for storage caverns or during actual cavern construction.