Q: I read the article “A Practical Review of the ANSI A92.2 Standard” in the October-November 2020 issue of Incident Prevention magazine (see https://incident-prevention.com/ip-articles/a-practical-review-of-the-ansi-a92-2-standard), and I’d like to know, is there a standard for the construction of electrically insulating bucket liners? We have problems with the geometry of a bucket. Because the walls of the bucket and the bucket liner are separated, I need to know the tolerance or maximum distance between the walls of those elements. Can you help?
A: We don’t know of a standard for liners other than the paragraph for buckets with liners in the A92.2 standard. That rule covers the requirements that the liner be rated and capable of passing the appropriate test. The liner also must be supported by the bottom of the bucket, leaving fit in the bucket up to the manufacturer and the buyer of the liner.
Liners are not required if workers are comfortable with that. Many workers have been brought through the industry with liners and believe they are mandatory and safer than buckets without liners. Again, however, liners are an option, and many utilities and contractors use them as a secondary level of protection. If you are gloving from a Category B bucket, the bucket itself is not required to have any primary insulating value because your primary means of protection are gloves, sleeves and cover-up. The bucket and boom are secondary barriers for the protection of the worker. As to the liner, the rule only requires that it be supported by the bottom of the bucket; therefore, it must be tall enough that it is not supported by the lip of the bucket. In the same way, the sides must be narrow enough that they do not support the liner on the sidewalls.