Document UT-MT-0573
Page 20 of 28
Edition 03/13/2012
Supersedes edition 02/09/2010
SLTH – SEMI-FLUSH THRESHOLD LIGHT
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
Figure 12 – Optical device (refer to the manual UT-MT-0485 for further information)
4.2.
INSTALLING THE LIGHT UNIT ON L-868 BASE, SIZE B
Install L-868 light base in compliance with FAA AC 150/5340-30.
The fixture is shipped complete (including the lamps) and is ready for installation as
received, except the dome outside O-Ring outside the dome separately supplied (Fig.1 –
n°19).
Be sure the flange on the transformer housing is clean and the O-Ring (if used) is in place
in the O-Ring groove.
Connect the plug of the fixture to the receptacle of the isolating transformer inside the
deep base. Connect the grounding wire of the fixture to the grounding wire of the deep
base (faston connection). Then press the fixture firmly and evenly by hand onto the base
flange. Secure the fixture to the base by using the six locking screws complete with
washers, supplied with the base. One drop of anaerobic adhesive, medium type (e.g.
Loctite 243) should be applied to the screws before installation; tightening torque is 25
Nm.
The fixture is subject to optical misalignment and/or mechanical damage if not properly
seated.
4.3.
SECONDARY WIRING
The IEC 61823 International Standard (AGL series transformers) states at para. 4.6 that
“if an earthing connection is provided, it shall be connected to the larger socket of the
transformer secondary connector.”
This means that, when a fixture is directly connected to the relevant isolation transformer
(provided with earthing connection), the fixture secondary side is wired to the grounding
network through the larger pin of fixture plug.
In case of an inset fixture, installed in the taxiway/runway pavement on its shallow base far
from the relevant isolation transformer, it is necessary to provide a secondary extension
between fixture and transformer. To help the installer to identify the larger socket of the
female connector inside the base (when installed), the base secondary cable leads are
identified by a colour code: the grey wire is wired to the larger socket, the black wire to the
other one. In this way it will be easy to assure the earthing wiring, above described,
between the larger socket of the transformer secondary connector and the larger pin of
the fixture plug.
5.
MAINTENANCE
WARNING
BEFORE ANY MAINTENANCE INTERVENTION, MAKE
SURE THE POWER SUPPLY BE SWITCHED OFF.
