93-509-09 - Issue 2 Rev 2 Page 16 of 20 Copyright Protec Fire Detection PLC
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Before connecting external cables to any field device, tests must be carried out using a 500V DC insulation tester
(Megger). The readings between each cable core, and each core and earth must be greater than 10M ohms
(record the readings). Equipment connected to the cabling during insulation tests could be damaged with the high
voltages produced. Great care must be taken during insulation tests to discharge the cables, since charged cable
may damage the control equipment upon connection.
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