N93-586-84 Issue 04 AB Page 7 of 32 © Protec Fire Detection plc 2015
4.0 Insulation Testing of Cabling Prior to Connection
Before connecting any external cables to any field device or the 3500, tests should be carried out using a
500V DC insulation tester (‘Megger
®‘
). If tests are performed the insulation readings between each cable
core, and each cable core and earth must be greater than 10MΩ.
The 3500 or associated devices must not be connected to any cables when high voltage
insulation tests are being performed on the cabling. The cabling must be completely
discharged prior to connection to the 3500. Equipment connected to the cabling during
insulation tests will be damaged by the high voltages used, invalidating any warranty.
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