Class Codes & Rates:

Code 4779 is applied to insureds engaged in the assembly of caps, primers, fuses, boosters or detonators including the mixing of charges or loading. All components are received from others along with initiating explosive charges such as lead azide, black powder, tetryl, etc., which may be received in metal or paper containers, or the charges may be received in bulk and stored in specially constructed buildings or magazines in accordance with the American table of distance as recommended by the institute of makers of explosives. The operations involve the loading of the components, staking the detonators into the fuse assemblies, and attaching primers. In some cases, adapters and boosters are involved. If the charges are received in bulk, usually a day's supply is delivered from the magazine and placed in a vault to be distributed as required in the assembly room. The particular charge is mixed, weighed and, in some cases, may be compressed into pellets. The material is then filled or packed into the particular device being loaded.