Practice question

What is the purpose of a 'megger test' (insulation resistance test) on traffic signal cable?

To measure the cable length
To verify that the cable insulation has not been damaged during installation by measuring resistance between conductors and between conductors and ground
To determine the cable's current-carrying capacity
To identify the cable manufacturer

Answer: B — To verify that the cable insulation has not been damaged during installation by measuring resistance between conductors and between conductors and ground

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