Positron Teleline 751960/13CU5, Описание и руководство по установке

Страница: 27 / 58

27
HVI Equipment Layout - Concept
stood upon. Therefore care should be taken when handling circuit equipment and
or wiring.
The Teleline equipment is designed to isolate the personnel and equipment from
the effects of the high and the low voltage condition of this site.
3.4.3 Cable Routing CO Side Non-Metallic Conduit
The CO Cable should be routed to the HVI utilizing a nonmetallic conduit. This
increases the insulation of the cable shield from earth ground contact via the
dielectric material of the conduit. This conduit should originate on the HVI
backboard and extend to a distance of at least 3 m (10 feet) beyond the grounded
perimeter fence. In addition the cable after it leaves the nonmetallic conduit
should not cross or come in contact with any grounded conductive surface.
3.4.4 Cable Routing Station Side Metallic Conduit
The station cable(s) that terminate on the HVI backboard should be routed to this
backboard utilizing a metallic conduit. If the distance between origination point
and the termination point of the HVI backboard is substantial, greater than 30 m
(100 feet), then a #2 copper bonding conductor should be run with the station
cables either exposed or in a metallic conduit of its own. This bonding conductor is
then tied to ground at both ends and the equipment connected to the cable pairs
is also bonded to this same ground point. This effectively puts both ends of the
station cable(s) and the serving equipment at the same earthing potential.
3.4.5 Crossing Cables and Ground Wires
The CO cable, or any cable that the shield is at remote ground potential should
not cross or come in contact with any ground wire or conductive surface within the
Zone of Influence of the substation.
The station cables are at local or substation potential. Therefore, they can be run
adjacent to or may cross local ground wires or grounded conductive surfaces.