When using fire alarm MC (18-2 twisted shielded pair) to wire an addressable fire alarm system what is the proper method for splicing the "drain" wire when making "T-taps"?
I was told to twist them together in the JB then wrap them with tape to prevent them from touching the metal JB thus preventing ground-faults.
Is the shield coming in contact with a grounded surface the cause of ground-faults?
Is this the correct way or not and why.
