UTM-00339 | Rev 19
Page 48 of 253
DetNet South Africa Copyright © 2021
The Surface harness wire consists of a pair of yellow and green individually sheathed copper wire, 0.63mm in
diameter.
Figure 8: Surface Harness Wire
DigiShot
®
Plus 4G Detonators are connected to the surface harness wire to enable communication with control
equipment.
The maximum length of 2-wire surface harness per channel, including the lead-in wire used to connect shall not
exceed 2500m.
BY EXCEEDING THIS LIMIT THE INHERENT RESISTANCE ON THE HARNESS WIRE WILL INCREASE
RESULTING IN POTENTIAL MISFIRES.
ALL JOINTS SHALL BE SECURELY TWISTED AND INSULATED TO PREVENT INTERMITTENT CONNECTIONS,
SHORT CIRCUITS AND EXCESSIVE LEAKAGE. THESE CAN BE A MAJOR SOURCE OF TROUBLE CAUSING
POTENTIAL MISFIRES.
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