Load or Charge rule define how holes are to be loaded based on the condition of the hole (depth, water, wet walls).

When applied to charge patterns, charge rules create hole specific load definitions describing all the explosives and inert decks and the in-hole initiation system for all holes in the charge pattern.

Charge rules are derived from charge standards. Local copies of charge rules are saved against charge patterns to prevent subsequent changes altering the charge detail.

Charge rules are drill diameter specific, this means that a charge pattern needs to have the same diameter blast hole.
This is a safety requirement as minimum stemming for flyrock control is directly related to blast hole diameter.