On Tuesday, October 20, 2015 at 10:59:23 AM UTC-4, trader_4 wrote:
He makes the ridiculous claim that telephone eqpt is only protected
at the point of entry to the building. In fact, they use the same
strategy as the IEEE recommends, ie a tiered protection approach.
That includes MOVs on the line cards inside the building.

How many times must one explain 'tiered protection' to you? Protectoin is not Kleenex for water from your eyes. Stop being so emotional.

Each tier in a CO is another ground layer. Every protection 'tier' is defined by its ground - not by protectors. Homeowners have two layers. A 'primary' surge protection layer at the pole. A 'secondary' protection layer at the service entrance (main breaker box or meter).

Every protection layer is only defined by what absorbs energy - earth ground. Had you ever been in a CO, then you knew of special care so that every protection layer - the grounding - is not compromised. You deny only to argue - not because you have any experience.

It was explained multiple times. Each protection layer is defined by a ground that harmlessly absorbs hundreds of thousands of joules. More protectors do not make more protection layers. A protector is only as effective as its earth ground. Some facilities have multiple ground 'layers'. You would know that by now if your purpose was to learn - not to attack.