> It does not necessarily apply to tie cables between buildings in conduit
Absolutely applies. Otherwise a lightning strike to any incoming utility wire in one building means that building acts like a lightning rod connected to Mitel equipment in the other building.
A ballpark number is often...
A surge protector rated for higher telephone voltages is required where each wire enters or exits the building. Each protector must make a low impedance (ie less than 3 meter) connection to each structures single point earth ground. If using multiple grounds for any one building, then surge...
First understand why damage happens. A destructive current found a path to earth apparently via your phone systems. If properly installed, the Comcast already has the best possible protection. A wire from the cable to single point earth ground. A current that is earthed BEFORE entering the...
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