231Signal tube firing

231 Signal tube firing (1) This section applies if a shot-firer uses a signal tube to initiate a blasting operation. (a) all connections are carried out in accordance with the manufacturer’s instructions; and (b) all connections are checked before initiating a blast; and (c) if possible, all fired signal tube is cleared from the blast site after the blast has been completed. (3) If both trunk and branch lines are used, the blast must be initiated in a trunk line. (4) A shot-firer must ensure that the firing position where the shot-firer initiates the signal tube is located outside the range of, or is adequately shielded from, any missile or other blast effect that may be produced by the blast. branch line means a length of signal tube running between, and connected to, the trunk line and the primer. trunk line means the main line of signal tube on the surface.