30 CFR Part 56Public Domain
§ 56.6602 — Static electricity dissipation during loading
Subpart E — Explosives
When explosive material is loaded pneumatically into a blasthole in a manner that generates a static electricity hazard—
(a)An evaluation of the potential static electricity hazard shall be made and any hazard shall be eliminated before loading begins;
(b)The loading hose shall be of a semiconductive type, have a total of not more than 2 megohms of resistance over its entire length and not less than 1000 ohms of resistance per foot;
(c)Wire-countered hoses shall not be used;
(d)Conductive parts of the loading equipment shall be bonded and grounded and grounds shall not be made to other potential sources of extraneous electricity; and
(e)Plastic tubes shall not be used as hole liners if the hole contains an electric detonator.
Public Domain: 30 CFR Part 56 (MSHA Safety and Health Standards — Surface Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.