User's Guide ______________________________________________________________________
74 __________________________________________________________________ M210667EN-C
An armored tube or similar should be used to mechanically protect the
AC cable and the signal cable from the termination box down into the
ground (0.7 m below the ground).
This equipment is designed for continuous 24-hour operation. The AC
power supply should be continuous and without spikes or blackouts. If
the AC voltage fluctuates outside the given tolerance, AC voltage
stabilizers are recommended.
Line Power Cable
LT31 should be equipped with a power cable of sufficient length with
free wire ends. If a local terminal with the power supply of 115/230 VAC
is not available, an extended AC cable from LT31 to the nearest power
source is needed. This cable should be armored and suitable for
underground use. The armored reinforcing acts as a mechanical shield
and also provides protection against lightning. The cable screen must be
grounded at both ends.
NOTE
A separate junction box, where the extended AC cable is terminated, is
highly recommended at the installation site. A junction box
(TERMBOX-1200/TERMBOX-9000) that fits inside the LT31 radiation
shield is available from Vaisala. See Figure 33 and Figure 34 on page
75. These junction boxes also contains extra lightning protection which
is recommended at sites where thunderstorms are common.
NOTE
The local safety regulations and practices concerning electrical systems
must be complied with.
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