WAC 212-17-327
Requirements for chain fusing. (1)
Wherever more than three shells are to be chain fused, such as
for sequential firing, additional measures shall be required
to prevent adjacent mortars from being repositioned in the
event that a shell explodes in a mortar, causing it to burst.
(2) For buried mortars, prevention of repositioning shall
be accomplished by spacing the mortars with a minimum
separation distance of four times their diameter.
(3) For mortars in racks, prevention of repositioning
shall be accomplished by mortar racks that have sufficient
strength to withstand such a failure successfully.
(4) Chain-fused mortar racks shall be positioned to
maximize the placement of racks perpendicular to spectator
viewing areas.
(5) Chain-fused mortar racks containing mortars three
inches or less in diameter shall be limited to a maximum of
fifteen mortars per unit. Racks containing mortars four
inches in diameter shall be limited to a maximum of twelve
mortars. Racks containing mortars five to six inches in
diameter shall be limited to a maximum of ten mortars.
Chain-fused racks shall not be used for mortars greater than
six inches.
Exception:
Boxed finale items containing tubes two and one-half inches or less in diameter only shall not be required to comply
with the limitation above.
(6) All chain-fused aerial fireworks devices, including
those not in mortar racks such as roman candle batteries and
multitube aerial items, shall be positioned securely to
prevent tip over or hazardous movement during operation. This
shall be accomplished by the use of stakes, racks, sandbags,
earth, or equivalent means.
(7) Staple guns shall not be permitted to be used to
secure quick match that is connected to aerial shells, mines,
or comets.
(8) Chain-fused aerial shells shall not be permitted to
be reloaded.