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Posted by w_tom on June 6, 2008, 7:10 pm
> My neighbor recently got shocked by a lightening strike while using the ph=
one. I
> told them the ground on their phone box was not connected. When they calle=
d
> Qwest, they were told that that was not the phone companies responsibility=
.
Even code says that earth ground must exist. From FCC Part
68.215d(4):
> All building and electrical codes applicable in the
> jurisdiction to telephone wiring shall be complied
> with. If there are no such codes applicable to
> telephone wiring, Article 800 ... and other sections
> of that Code incorporated therein by reference
> shall be complied with.
From the National Electrical Code Article 800.30:
> Location.
> The primary protector shall be located in, on, or immediately
> adjacent to the structure or building served and as close as
> practical to the point of entrance.
> ...
> The primary protector shall consist of an arrester connected
> between each line conductor and ground in an appropriate
> mounting. ...
> Size
> The grounding conductor shall not be smaller than 14 AWG. ...
> Length
> The primary protector grounding conductor shall be as short
> as practicable. ... not to exceed 6.0 meters (20 ft) in length.
Your telco may only earth to provide human safety. To also provide
transistor safety, that earthing must meet and exceed post 1990
earthing requirements. Some of those additional requirements were
provided previously: 'less than 10 foot', separated from other non-
grounding wires (ie safety ground inside Romex cable is not earth
ground), no splices, no sharp bends, etc. Violating these earthing
requirements means a surge may seek earth ground, destructively, via
household appliances (ie modem, answering machine, portable phone base
station).
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