UTM-00339 | Rev 19
Page 245 of 253
DetNet South Africa Copyright © 2021
When stemming holes with aggregate it is important to do the following:
• Position the down-line wire to mitigate damage as much as possible.
• Pull down-line wire away from the side from which stemming material is being poured down the hole.
Ensure that all slack is taken-up to prevent kinking inside the stemming column. Kinking will result in the cable
snapping if slumping is experienced.
Tagging according to a plan and ensuring all Users adhere to this plan is important to reduce errors during blasting:
• Always ensure that a proper blast and tagging plan is available and that all personnel partaking have a
clear understanding of the tagging method and channel allocation. Duplicate, missing or extra detonators
and/or detonators on the wrong channel will have a negative impact at blasting time if discovered on the
Bench Commander.
• Ensure that CE4 Tagger head is clean and free of water droplets or emulsion especially between the two
Pogo-pin connectors. This helps to prevent a conductive path between the connectors that will add
leakage during tagging and testing.
• When tagging using the “through holes” ensure that the CE4 Tagger head is regularly cleaned and
connectors closed and placed properly on the stake.
• When tagging directly on the tines, inspect the tines for alignment with harness wire guiding groves, that
the spade gap is in good repair and ensure that connector is properly closed and placed on the stake
• Ensure that Tagging is performed according to tagging plan and that all detonators are tagged to prevent
the system discovering extra or missing detonators during blasting
• When the connector is damaged or does not make proper contact and needs to be removed, cut the down-
line wires and strip the insulation sufficient in length to fit into the Back-to Back Connector without
protruding on either side of the connector as this can result in a short circuit.
Harnessing according to the blast design will reduce fault diagnostics. Also take note of the following:
• Always use the correct harness wire as specified.
• Test roll of harness wire using Tagger to ensure it is in good repair and no short circuits are present.
• When uncoiling the harness wire, ensure that it is uncoiled from the inside out to prevent tangling of wire.
• Where possible, connect harness wire in the same sequence as tagging, keep to the system limits and to
the tagging plan.
• Open detonator connector and ensure it is free of dirt or moisture as well as being in a good condition,
separate twisted pair with thumb, place harness wire onto connector aligning it with the guiding grooves
and corresponding tines. Next, tighten wire over connector ensuring that harness wires are properly
aligned and close connector until it clicks shut. If both wires are pushed into the same time it will result in a
short circuit. If the harness wire is not properly positioned it can become trapped between the closing lid of
the connector and the top of the tine which will result in a harness break or intermittent connection, which
will be time consuming when doing fault diagnostics
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