ERICO 3000 ERITECH SYSTEM - Manual (Page 56)

INSTALLATION, OPERATION AND MAINTENANCE MANUAL
54
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Most towers would be less than 70 m,
or so, in height so that a single ERITECH ®
ERICORE downconductor would suffice.
However, where the tower is over the
maximum single length but less than twice
the maximum single length (typically 70 m
(230 ft) to 140 m (460 ft) in height), it is
preferable to run twin ERITECH ® ERICORE
downconductors. These conductors should
ideally run down opposite legs of the tower
and each connect into the ring earth at the
base of the tower.
Alternatively, and less preferably, a
single upper section of typical length
70 m (230 ft) could be run from the top
of the tower to a point lower down on the
tower, then bonded to the tower using a
waterproofed lower termination. A conven-
tional lightning downconductor could be
run from this point down to the base of the
Buildings
Buildings less than 70 m (230 ft), or so,
in height are served by a single ERITECH ®
ERICORE downconductor.
Buildings of height over the maximum
single length but less than twice the
maximum single length (typically 70 m
(230 ft) to 140 m (460 ft) in height) may
be installed with either twin ERITECH ®
ERICORE down-conductors, or a series
connection in the service shaft.
Buildings of height greater than twice the
maximum single length (typically greater
than 140 m (460 ft) in height) need to
use the series connection method. The
ERICO application engineering group will
determine the allowable lengths of the
lower cable sections, which may be able
to be longer than the upper length, and
in some cases, the lower sections may be
conventional downconductor.
When to use a twin ERITECH ® ERICORE
arrangement or a series connected
arrangement depends on the particular
circumstance. The following examples
give typical guidance.
The upper terminations on all lower
sections of ERITECH
® ERICORE cable are to
have the structural bonding braids removed.
The following diagram indicates how this is
done. The cold shrink is rolled back as far as
possible, and the structural bonding braid If an upper termination lug coupling is not
available, a TERMLUGCOUPL may be used
in conjunction with a coupling tube (part:
ERICOREUTSP) as shown here.
Practical examples for Long Lengths of ERITECH ® ERICORE
Removal of Structural Bonding Braid
cut off as far back as possible. Then the
coldshrink is rolled back in place, covering
the freshly cut braid. Discard the cut off
braid and terminal block.
Alternative attachment of
upper termination to busbar
Telecom Towers
tower. This arrangement helps ensure that
the lightning current bypasses the sensi-
tive tower mounted electronics mounted
in the antennas on the top half of the
tower.