UTM-00339 | Rev 19
Page 247 of 253
DetNet South Africa Copyright © 2021
When deciding on a suitable blast point and setting up multiple Base stations for blasting, the following must be
noted:
• Ensure that all spare Commanders and CE4 Taggers in the transporting vehicles are switched OFF to
prevent RF interference with Commanders used in the blast.
• If more than one Base Commander is in use, ensure that they are further than 10 metres apart to eliminate
RF communication interference.
• Poorly made joints when joining Harness Wire.
• Re-using Harness Wire.
• Leakage occurs when a damaged Harness Wire lies in water or emulsion. The water and emulsion are
both conductive substances that can result in leakage. The same can occur if a connector is left
submerged in water or emulsion indefinitely. It is advisable to raise the connectors off the ground, or at
least away from standing water, if the ground conditions are very wet.
• Detonator down hole wire – holes not correctly de-sludged, rubbing of down hole line against hole wall,
bent cable when lowering booster into a hole
• Detonator cable damaged around the insulation exposing the steel wire
• Ingress of water or moisture into connector
• Harness wire not properly secured inside connectors
• Short circuits occur when the harness wires are exposed and touch each other.
• SHORTS are typically identified by very high leakage errors - >19mA
IT IS ADVISED THAT ONCE THE SYSTEM IS TAGGED, TESTED AND FOUND TO BE READY FOR BLASTING THAT
THE CONNECTED CONTROL EQUIPMENT IS SWITCHED OFF UNTIL BLASTING TIME TO REDUCE THE
LIKELIHOOD OF LEAKAGE CAUSED BY CORROSION.
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