OCEM SLTH Instruction manual

Via 2 Agosto 1980 n°11
40016 SAN GIORGIO DI PIANO
BOLOGNA ITALY
Document UT-MT-0573
Page 1 of 28
Edition 03/13/2012
Supersedes edition 02/09/2010
THIS COPY IS NOT SIGNED SINCE IT IS FILED AND DELIVERED BY MEANS OF THE AUTOMATIC KNOWLEDGE MANAGEMENT SYSTEM (IT CAN BE SIGNED ON
REQUEST)
THIS DOCUMENT AND THE DATA CONTAINED HERE IN, IS PROPRIETARY PROPERTY AND SHALL NOT BE DUPLICATED, USED OR DISCLOSED – IN WHOLE OR IN
PART – FOR ANY PURPOSE WITHOUT WRITTEN CONSENT OF O.C.E.M. S.p.A.
SEMI-FLUSH
THRESHOLD LIGHT
SLTH
INSTRUCTION MANUAL FOR USE,
INSTALLATION AND MAINTENANCE
Compiled by: N. Marabini Approved by: P. Scaramagli
N°Attachments: Copy n°:

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SLTH – SEMI-FLUSH THRESHOLD LIGHT
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
EDITION
Data
02/09/2010 Emission
03/13/2012 Second Edition
REVISIONS
Index Date Description Written by Approved by
LIST OF VALID PAGES
From page 1 to page 28

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SLTH – SEMI-FLUSH THRESHOLD LIGHT
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
LIMITED PRODUCT WARRANTY
THE FOLLOWING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, WHETHER EXPRESS, IMPLIED OR
STATUTORY, INCLUDING, BUT NOT BY WAY OF LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR
ANY PARTICULAR PURPOSE.
OCEM warrants t each riginal Buyer f Pr ducts manufactured by the C mpany that such Pr ducts are at the time f delivery t
the Buyer, free f material and w rkmanship defects, pr vided that n warranty is made with respect t :
(a) any Pr duct, which has been repaired r altered in such a way, in C mpany’s judgement, as t affect the Pr duct adversely;
(b) any Pr duct which has, in C mpany’s judgement, been subject t negligence, accident r impr per st rage;
(c) any Pr duct which has n t been perated and maintained in acc rdance with n rmal practice and in c nf rmity with
rec mmendati ns and published specificati n f C mpany; and,
OCEM’s bligati n under this warranty is limited t use reas nable eff rts t repair r, at its pti n, replace, during n rmal w rking
h urs at the facility f the C mpany, any Pr duct which in its judgement pr ved n t t be as warranted within the applicable warranty
peri d. All c sts f transp rtati n f Pr ducts claimed n t t be warranted and f th se repaired r replaced, t r fr m the facility f
the C mpany shall be b rne by Purchaser. C mpany may require the return f any Pr duct claimed n t t be as warranted t its
facility, transp rtati n prepaid by Purchaser, t establish a claim under this warranty. The c st f lab ur f r the installati n f a
repaired r replaced Pr duct shall be b rne by Purchaser. Replacement parts pr vided under the terms f this warranty are
warranted f r the remainder f the warranty peri d f the Pr ducts up n which they are installed t the same extent as if such parts
were riginal c mp nents there f. Warranty services pr vided under the Agreement d n t assure uninterrupted perati ns f
Pr ducts; C mpany d es n t assume any liability f r damages caused by any delays inv lving warranty service.
IMPORTANT: READ THIS DOCUMENT
Bef re pr ceeding t the perati ns f installati n, c mmissi ning, perati n, maintenance r disp sal, carefully read the entire
d cument.
SAFETY INFORMATION
Extreme cauti n sh uld be exercised when w rking with this equipment; it is n rmally used r c nnected t circuits that perate at
danger us v ltages and can be fatal.
The f ll wing secti n c ntains imp rtant safety inf rmati n that y u must f ll w when installing and using the apparatus.
Misuse f the equipment r lack f care in applying safety pr cedures and prescripti ns specified in this d cument, may result in a
hazard.
Av id c ntact with v ltage r current s urces.
F r n reas n the pr tecti ns and the safety devices must be rem ved.
OPERATION ON THE EQUIPMENT - SKILLS
Operati n n the equipment and access t its internal parts shall be d ne by experienced pers nnel, adequately trained and aware
f the risks related t electricity and high v ltages.
Safety rules shall be ad pted when perating n the equipment, r n cables and ther apparatus c nnected t the it.
DO NOT OPERATE ON ENERGIZED CIRCUITS
D n t carry ut any perati n n the c nverter r n apparatus c nnected t it when the circuits are energized.

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INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
WHEN HANDLING AND SERVICING THIS EQUIPMENT, OBSERVE PRECAUTIONS
FOR HIGH VOLTAGE EQUIPMENT
Bef re any access, inspecti n r interventi n, be sure t have switched- ff the unit, pened the main circuit breaker and rem ved
the supply t the unit (by pening the circuit breaker/switch n the distributi n b ard at the beginning f the supply line).
Then wait discharge time (at least 5 minutes), gr und carefully the system, and check f r v ltage presence bef re accessing.
REANIMATION
The maintenance staff must be aware f the risks related t electricity, criteria t prevent the risk f electric sh ck and resuscitati n
techniques.
CE MARK
This equipment c mplies with the requirements f Eur pean regulati ns f r the CE mark.
The user has t respect all prescripti ns rep rted in this d cument.
This equipment c mplies with the requirements f the EEC directives 2004/108/EEC and 2006/95/EEC with regard t
“Electr magnetic C mpatibility” and “L w V ltage Electrical Apparatus” respectively.
OUT OF SERVICE
In case f dismantling, dec mmissi ning, destructi n, disp sal, the user shall f ll w all the required precauti ns f r c mp nent and
material eliminati n, acc rding t l cal rules and applicable law.

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TABLE OF CONTENTS
EDITION .........................................................................................................................................2
REVISIONS.....................................................................................................................................2
LIST OF VALID PAGES..................................................................................................................2
LIMITED PRODUCT WARRANTY..................................................................................................3
SAFETY INFORMATION................................................................................................................3
TABLE OF CONTENTS..................................................................................................................5
1. GENERAL ...............................................................................................................................7
2. MAIN FEATURES....................................................................................................................7
2.1. REMOVABLE LIGHT UNIT ............................................................................................7
2.2. SHALLOW BASE.........................................................................................................13
3. INSTALLATION.....................................................................................................................14
3.1. INSTALLING THE SHALLOW BASE...........................................................................16
3.2. INSTALLING THE LIGHT UNIT ON L-868 BASE, SIZE B...........................................20
3.3. SECONDARY WIRING.................................................................................................20
4. MAINTENANCE.....................................................................................................................20
4.1. REMOVING AND OPENING THE LIGHT UNIT FROM THE BASE .............................21
4.2. PRIMS CLEANING.......................................................................................................21
4.2.1. Prism outside cleaning..................................................................................21
4.2.2. Prism outside cleaning..................................................................................21
4.3. PRISM REPLACEMENT...............................................................................................22
4.3.1. Removing the prism......................................................................................22
4.3.2. Installing the new prism................................................................................22
4.3.3. Pressure test ................................................................................................22
4.4. FILTER REPLACEMENT..............................................................................................23
4.4.1. Removing the filter........................................................................................23
4.4.2. Removing the filter........................................................................................23
4.5. RELAMPING.................................................................................................................23
4.6. GASKETS.....................................................................................................................23
4.6.1. Gasket examination......................................................................................23
4.6.2. O-Ring replacement......................................................................................24
4.7. CABLE LEAD WITH PLUG..........................................................................................24
4.7.1. Removing the cable lead with plug...............................................................24
4.7.2. Installing the new cable lead with plug..........................................................24
4.7.3. Pressure test ................................................................................................25
4.8. VIBRATION-DAMPING BLOCK...................................................................................25
4.9. PRESSURE VALVE......................................................................................................25
4.10. CLEANING ...................................................................................................................25
4.11. MAINTENANCE PROGRAM ........................................................................................26

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4.11.1. DAILY OPERATIONAL CHECKS..............................................................26
4.11.2. CLEANING ................................................................................................26
4.11.3. SNOWPLOW OPERATIONS....................................................................26
4.11.4. MONTHLY INSPECTIONS........................................................................26
4.11.5. SCREWS TIGHTNESS.............................................................................26
4.11.6. LEAKAGE TEST........................................................................................27
5. LIST OF THE RECOMMENDED SPARE PARTS..................................................................28
LIST OF FIGURES AND TABLES
Figure 1 – Section view and Part List..................................................................................9
Figure 2 – Complete P/N identification..............................................................................10
Figure 3 – Dome – Outside view.......................................................................................11
Figure 4 – Dome – Inside view..........................................................................................11
Figure 5 – Lower cover optional fuse cutout – Inside view................................................12
Figure 6 – Lower cover with optional electronic cutout relays – Inside view......................12
Figure 7 – Standard 12” shallow base (mounting system “B”)...........................................13
Figure 8 – Example of threshold configuration (one transformer per each fixture)............15
Figure 9 – Sawcutting and joint intersection details...........................................................16
Figure 10 – 12” shallow base for side or bottom ducts (method “B”).................................18
Figure 11 – Shallow base installation details.....................................................................19
Figure 12 – Optical device (refer to the manual UT-MT-0485 for further information).......20

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INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
1.
2. GENERAL
SLTH Semi-flush threshold light is high intensity, unidirectional, inset, 12” steady-
burning type.
These fixtures are intended for use as threshold of runways (green lighting) in
order to provide a visual aid to the moving aircraft.
SLTH lights are in compliance with ICAO Annex 14 Vol.1, FAA AC 150/5345-
46 (Style 2), IEC TS 61827 (Style 3) and NATO-STANAG 3316.
The fixtures described in this manual are designed to be connected to series circuit, fed
through standard isolation transformers connected to CCR with variable current from 2.8 A
to 6.6 A.
Location of these fittings shall be in compliance with ICAO – Annex 14, STANAG 3316
and FAA
3. MAIN FEATURES
Each light assembly consists of a removable fixture and a shallow base receptacle
(mounting system B - See fig.7). The fixture is waterproof and designed to withstand
aircraft impact and roll-over loads without damage.
The beam toe-in is obtained inside the light unit through different positioning of the lamps.
In this way all lights result mechanically identical and the shallow base installation
becomes very easy because no precise toe-in is required during civil works.
3.1. REMOVABLE LIGHT UNIT
The removable fixture mainly consists of a dome, an optical assembly and a lower
cover (figs. 1/2/3/4/5/6)
The dome is made of treated aluminium casting and includes two windows to seat the
prisms, complete with gaskets, kept in the proper position by means of a mounting plate
fixed with three screws FHCS M5x12 (fig.1 - n°7).
The dome is provided with six through holes for fastening the fixture to the base and two
suitable slots, in opposite position, to make easy the fixture removal by using two suitable
lifting tools (available on request, P/N 332.4140 or 332.4230). As alternative, two
screwdrivers can be used.
A silicone O-Ring (separately supplied) has to be mounted outside around the dome, to
avoid dirt deposits between dome and shallow base (fig.1 - n°19).
The optical assembly consists of two prisms (fig.1 – n°3) with relevant gaskets (fig.1 –
n°4), two filters with relevant holder (fig.1 - n°8 ,9) and two lamps (fig.1 - n°13).
Fixtures can be provided with three kind of lamp supporting plate in order to obtain the
following configurations:
 FAA no toe-in SLTH-A-ST (P/N 153.0011)

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 ICAO right toe-in SLTH-G-LI (P/N 153.0021)
 ICAO left toe-in SLTH-G-RI (P/N 153.0031)
The lamp is of tungsten-halogen type, rated 105 W 6,6 A, 1000 hours average lamp life,
with dicroic reflector and male faston plug wires. The lamp is locked into its seat by a
single elastic holder (stainless steel) in order to realize an easy and quick lamp
replacement.
All the optical assembly parts are factory assembled; they may be field-replaced if
necessary (parr. 4.3 - 4.4).
The lower cover consists of a treated aluminium casting; it is fastened to the dome by
means of three screws HSCH M5x16 (fig.1 - n°22). An O-Ring (fig.1 – n°20) is provided
between dome and lower cover. The dome is equipped with a reference pin for its proper
positioning on the lower cover.
The cover is provided with one threaded hole for cable entry and external grounding screw
with yellow-green cable lead, size 2.5 mm
2
, 0.460 m long, with male faston terminal. A
suitable valve is outside mounted for the leakage test.
Watertightness between fixture and shallow base is ensured by means of an O-Ring (fig.7
– n°7 separately supplied) to be placed on the rele vant groove on the shallow base.
The fixture is supplied with one cable lead with L-823 plug; it consists of two single-pole
teflon leads, size 2.1 mm
2
(#14 AWG), 0.700 m long. The plug is in compliance with FAA
AC 150/5345-26 for very quick coupling with the receptacle mounted on the shallow base.
The fixture 304 mm in diameter and 123 mm (+ 18,5 mm for plugs) high; the protrusion
above the ground is 12.7 mm.
An identification data label is externally applied over the lower cover (fig.1 – n°30).
Moreover, to identify quickly the beam colour, the dome, in front of the windows is painted
in the same colour of the light beam.
The same colour painting is provided outside on the lower cover.
See fig.2 for complete P/N information.
All hardware is made of stainless steel.

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Nr. Description Qt. Nr. Description Qt.
1 - Dome ..............................................1
2 - Lower cover.....................................1
3 - Prism...............................................2
4 - Prism gasket ...................................2
5 - Prism nylon gasket..........................2
6 - Mounting plate.................................2
7 - FHCS M5x12 inox screw.................6
8 - Filter................................................2
9 - Filter-holder.....................................2
10 -BHC M5x10 inox screw...................4
11 -Lamp supporting plate.....................2
12 -Lamp elastic spring.........................2
13 -Lamp...............................................2
14 -Vibration-damping block..................4
15 -Spacer.............................................4
16 -HSCH M5x25 inox screw ................4
17 -ø5 inox grower washer....................5
18 -ø5x10x1 inox washer ......................7
19 -O-Ring 41150 silicone.....................1
20 -O-Ring 6850 silicone.......................1
21 -Expanded PTFE strip......................1
22 -HSCH M5x16 inox screw.................3
23 -Cable gland – Nut............................1
24 -Cable gland – Washer.....................1
25 -Cable gland – Washer (PTFE)........1
26 -Cable gland – Gasket......................1
27 -Cable lead with plug........................1
28 -Cable lead with plug - Female faton
terminal............................................4
29 -Grounding cable lead with male
faston terminal.................................2
30 -Identification label ...........................1
31 -Bare copper plate............................2
32 -HSCH M4x10 inox screw.................2
33 -ø4inox grower washer.....................2
34 -ø4x12x1 inox washer.......................2
35 -Insulating strip.................................2
36 -Fuse cutout .....................................2
Figure 1 – Section view and Part List

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SLTH – A – ST – 200 – B – F
Basic P/N:
Colour:
G = Green
A = Green FAA **
Toe-in *:
RI = Left
LI = Right
ST = Straight
Lamps:
200 = 2x105W 6.6A reflectorized
Mounting Assembly:
B = Standard Shallow Base, 12” dia
O = No Mounting Assembly
Options:
F = Fuse Cutouts
E = Electronic Cutout Relays
FAA Approved, ETL certified.
* Toe-in
The beam aiming is not field adjustable.
** Colour “A“ may be combined with Toe-in “ST“ only.
Figure 2 – Complete P/N identification

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1 - Prisms
2 - Through holes for light
unit fastening
3 - Slot for dome removal
4 - Painted area to identify
the beam colour
5 - Label with arrow for
toe-in identification
Figure 3 – Dome – Outside view
1 - Window to seat the
prism
2 - Through holes for light
unit fastening
3 - Holes for lower cover
fastening
4 - Lower cover reference
pin
5 - Holes for mounting
plate fastening
6 - Holes for filter support
fastening
7 - Slots for dome removal
Figure 4 – Dome – Inside view

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1 - Cable lead with plug
2 - Insulating strip-
insulating strip cable
3 - Insulating strips
4 - Insulating strips
fastening screws
5 - Lamp supporting plate
identification label
6 - Leak test valve
Figure 5 – Lower cover optional fuse cutout – Inside view
1 - Cable lead with plug
2 - Relay-relay cable
3 - Electronic cutout
relays
4 - Relays fastening
screws
5 - Lampholder
identification label
6 - Leak test valve
Figure 6 – Lower cover with optional electronic cutout relays – Inside view

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3.2. SHALLOW BASE
The shallow base (mounting system B) (fig.7) consists of a treated aluminium casting
containing an electrical feed-thru system to connect the power cables, consisting of one
cable lead with receptacle incoming inside the base through one cable gland. The cable
lead with receptacle consists of two single-pole leads, size 2.5 mm
2
, 1 m long, with FAA L-
823 receptacle.
The letter "A" is printed inside the base for cable leads identification.
The base is equipped with an internal grounding screw with yellow-green cable lead, size
2.5 mm
2
, 0.250 m long, with female faston terminal for quick connection to the
corresponding of the fixture. An additional external grounding screw is provided close to
the cable entry.
The shallow base is designed for cementing in place by means of epoxy-resin in a hole
drilled in the pavement.
The fixture has to be fastened to the base by means of six hex cap screws, complete with
external silicon-coated lock-washer.
An O-Ring (separately supplied) must be placed between base and fixture for
watertightness (fig.7 - n°7) placed in the relevant shallow base groove.
The 12” shallow base is 320 mm in diameter and 150 mm high.
On request, special bases without cable lead can be supplied, provided with holes suitable
for conduit connections.
Inside the base two suitable holders (fig.7 - n°9) are provided to properly sustain the
secondary power cable, in case of this cable is inside incoming through a conduit.
1 - Cable gland for cable entry
2 - External grounding screw
3 - Cable leads with socket
4 - Internal grounding screw
5 - Grounding cable with female
faston terminal
6 - Letters “A” for cable lead
identification
7 - O-Ring between fixture and base
8 - Threaded inserts for fixture
fastening by bolts
9 - Power cable holders
Figure 7 – Standard 12” shallow base (mounting system “B”)

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4. INSTALLATION
Using the scheme of light configuration in fig.8, drill each recess in pavement following the
instruction in fig.9. Make sure the recess size and depth are maintained within the
specified limits. All surfaces of the recess must be clean and dry. If any of these surfaces
is damp, it is desirable that it be dried and blown clean with a compressed air blast. The
recess side walls must be perpendicular to the pavement surface. The bottom surface
must be flat or slightly concave to assure that the shallow base rest securely and in true
position. The recess can best be drilled using a diamond-faced core drill in a sturdy, stable
drill rig.
Mark on the pavement surface the aiming direction of the light by chalk, nails or other
devices.

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Figure 8 – Example of threshold configuration (one transformer per each fixture)

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Figure 9 – Sawcutting and joint intersection details
4.1. INSTALLING THE SHALLOW BASE
Two different installations are possible:
 Method “A” – cable leads to be laid in wireways
 Method “B” – cable leads to be laid in cable ducts (fig.10)
Proceed as follow to realize a proper installation.
A B
1
 
Unscrew the six locking screws and remove the fixture from the base
using
the lifting tool P/N 332.4140 or 332.4230 (as alternative two
screwdrivers can be used).
2
 
To assure an adequate bond between base and hole all external
surfaces of the base should be sandblasted and must be cleaned with
solvent. TAKE CARE NOT TO DAMAGE THE ELECTRICAL SYSTEM.
3
 /
Connect an insulated G/Y grounding wire of suitable length to the
grounding screw externally provided on the wall of the base.

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4
 /
Splice the light base leads to the power cables using solderless squeeze
connectors, a
s shown in the figure, crimped with the proper tool.
Connect also the grounding wire to the main grounding network by using
a suitable clamping lug.
ATTENTION: Insulate each splice carefully using either heat
shrinkable in
sulating tubing properly applied or at least three
layers of plastic electrical insulating tape applied with half overlap.
5
  Mount the positioning jig (P/N 332.4301) on the base as shown in fig.11.
An optical device for proper fixture orientation is available (P/N
332.4351 fig.12).
6
 /
Properly arrange the leads in the wireways using small pieces of
insulating tape if necessary.
7
 
Completely cover the bottom of the base with sealer material, apply a
thin coat of sealer to the bottom of the drilled hole to assure a bond
between the bottom of the light base and the drilled hole. It may be
necessary to place temporary
plugs so as to block the wireways
entrances into the drilled hole (METHOD “A”) or the cable ducts
entrance (METHOD “B”). The plugs will retain the sealer while it begins
to dry up.
ATTENTION: avoid starting the installation when the ambient
temperature is
below 10°C (86°F), unless the sealer used is
designed to dry up at a lower temperature.
8
 
Push the base into the recess until its upper side is at the level of the
pavement surface; take care no sealer flowing inside the base. Align the
notch of the base with the markings on the pavement surface.
9
 / Observing the circular level fixed o
n the jig, level the jig by operating the
three leveling lobe knobs (fig.11). If necessary, a weight may be placed
on the jig to hold the light base in position.
The remainder of the space between the sides of the shallow base and
the drilled hole should b
e filled with sealer up to approx 25 mm from the
pavement, according to the local needs.
Fill the remaining 25 mm with a suitable joint sealing filler.

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10 /

Observing the circular level fixed on the jig, level the jig by operating the
three leveling lobe knobs (fig.11). If necessary, a weight may be placed
on the jig to hold the light base in position.
When the shallow base is in its final position, the cond
uit(s) must be
properly jointed to the hole(s) provided on the shallow base. This(these)
hole(s) can be provided either on the wall either on the bottom, the
number and the dimensions according to customer requirements
(fig.10).
The remainder of the space
between the sides of the shallow base and
the drilled hole should be filled with sealer up to approx 25 mm from the
pavement, according to the local needs.
Fill the remaining 25 mm with a suitable joint sealing filler.
11 /
 Lay the secondary power cable, equipped with a suitable two-
pole
receptacle kit, and the grounding wire inside the cable duct.
12
  To install the fixture place the O-Ring around the dome (fig.1 -
n°19)
and between fixture and base (fig.7 - n°7); co
nnect the plug and the
grounding wire of the fixture with the receptacle and the grounding wire
of the base; press the fixture by hand onto the base and secure it using
the six locking screws complete with washer, one drop of anaerobic
adhesive, medium type (e.g. Loctite 243), should be applied.
Tightening torque is 44 Nm.
ATTENTION: The fixture is subject to mechanical damage and/or
optical misalignment if not properly seated on the base flange.
Ø320 Ø320
Ø100
12.7
150 150
12.7
Figure 10 – 12” shallow base for side or bottom ducts (method “B”)

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1 - Positioning jig
2 - Align the jig notch
with the mark on the
pavement
3 - Circular level
4 - Screws and spacers
for the jig mounting
5 - Lobe knob for
positioning jig
levelling
6 - Shallow base
notches aligned with
the notch on the jig
7 - Shallow base
Figure 11 – Shallow base installation details
1 - Positioning jig holes
for optical device
reference pins
2 - Fixing knobs

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.