SCO
Series Cutout
Compliance with Standards
FAA: AC 150/5340-30A (Current Edition)
Ordering Code
1475.92.030
Note: For unique key option, use part number 1475.92.030-1
Uses
Performance
Features
Construction
Speeds up routine maintenance operations no need to
disconnect any cable
1. Cover
2. Body
3. Insulation measurement socket.
4. Locking key
5. Microswitch
6. Body fastening holes
7. Series cable stress relief and grounding clamps. Grounding clamps for use only on shielded series circuit cable.
8. Grounding terminals
Three positions operation, maintenance and test
can be used by rotating the plug-in cover 90 in either
direction
Normal and maintenance positions can be locked with
a key for enhanced safety
Reliable operation, even in moist environments, due to
its unique body shape and the improved separators that
increase the arcing distances
Withstands:
Permanent 5 kV circuit voltage and
currents up to 20 A
Ambient temperature:
-67 F to +131 F (-55 C to +55 C)
Microswitch rated:
2 A, 440 VAC
Construction
Prevents arcing thus ensuring the long life of the contacts. The built-in microswitch energizes the regulator after
the contacts are engaged (or de-energizes the regulator
before the contacts are totally opened).
Provision for grounding of the series circuit cable shield (if
used)
High mechanical resistance the special epoxy resin is
more shock-resistant than porcelain
2
3
Integral handle provides positive grip to assist extraction
and insertion efforts
20 A current carrying capacity, 5 kV working voltage
Compatible with all types of L-828/L-829 CCRs and L-847
circuit selectors
Heavy brass terminals for easy and reliable connection of
series cables
Dependable insulation under all conditions due to the use
of flame retardant epoxy resin
Permits undisturbed operation of the remote control circuits
during maintenance or repair of field circuits
Body fastening holes reinforced with metal inserts
The SCO has a red color-saturated epoxy resin finish
Unique Key Option: Standard units come keyed alike. For
units with unique keys, use part number 1475.92.030-1.
Packaging
Power Equipment
A series cutout (SCO) isolates the series circuit from the constant current regulator (CCR) during maintenance or testing
operations. It allows periodic insulation resistance measurement of the series circuit to ground without disconnecting
the series cable. ADBs SCO is patented under U.S. patent
number 5952737.
FIG. 1
SCO Grounding Cover
A technique used during series circuit maintenance and
troubleshooting procedures is to connect one of the constant
current regulator output terminals to earth ground. SCO
Grounding Covers are available to allow this to be quickly
and easily accomplished. Two different Grounding Covers
are used. Substituting the gray-colored SCO top cover (in the
Operation position) grounds one side of the CCR output.
Substituting the black-colored SCO top cover grounds the
other side of the CCR output.
SCO Grounding Cover Ordering Code
Net weight:
6 lb (2.7 kg)
Packing specifications:
Variable with quantity
Gray SCO Grounding Cover
Black SCO Grounding Cover
Part No. 63A1090/1
Part No. 63A1090/2
2003 Rev. L
Manual No. 96A0294
B - 17
Outline Dimensions
Working Diagrams
5.1 in (130 cm)
Three positions are provided (see Fig. 4 & 5):
Operation position the regulator is connected to the
series circuit and the microswitch is activated.
Maintenance position the regulator and the series
circuit are both shorted and grounded and the microswitch
is not activated.
0.43 in (1.1 cm)
8.7 in (22.0 cm)
1.8 in
(4.6 cm)
2.4 in
(6.0 cm)
5.5 in
(14.0 cm)
Power Equipment
0.63 in
(1.6 cm)
FIG. 2
Test and measure position the regulator is shorted and
grounded; the series circuit is shorted and connected to
the measurement socket; and the microswitch is activated.
In this position, the insulation resistance of the series
circuit can be measured. The regulator operation can be
tested under short-circuited output conditions.
An activated microswitch means that the normally open contact is closed and that the normally closed contact is open.
For interlocking with the CCR, only the normally open contact
is used. When the cover is removed, the microswitch is not
activated.
Working Diagrams
NO
Microswitch
NC
Installation
The SCO is installed in the vault, for example, on the output
side of the regulator and wired between the series loop on one
side and the constant current regulator output terminals on the
other side. The CCR and load sides of the cutout are clearly
marked and must not be reversed (Fig. 5).
Regulator
OPERATION
Ground
In case L-847 circuit selectors are used, the cutouts may be
used on either side (input or output) of the selectors, but most
often on the output side (one cutout for each series circuit).
Note: Grounding terminal (Fig. 1, Item 8) must be grounded
for safe operation. Grounding clamp (Fig. 1, Item 7) must not
be present for unshielded L-824 applications.
Series Circuit
NO
Microswitch
Regulator
NC
Series Circuit
MAINTENANCE
Ground
Installation
Microswitch
Regulator
TEST AND
MEASURE
NO
NC
Series Circuit
Ground
Measurement
Socket
FIG. 4
CCR
FIG. 3
Load
Spare Component
Description
Part No.
SCO Lock and Key Assembly
85A0105
Canada
canada@adb-air.com
+1.905.331.6887
B - 18
2003 Rev. L
Manual No. 96A0294
Brasil
brasil@adb-air.com
+55 (11) 6615.7209
Product specifications may be subject to change, and
specifications listed here are not binding. Confirm current
specifications at time of order.
FIG. 5
ADB Airfield Solutions
Leuvensesteenweg 585
B-1930 Zaventem
Belgium
Telephone:
+32 (2) 722.17.11
Fax:
+32 (2) 722.17.64
www.adb-airfieldsolutions.com
ADB Airfield Solutions, LLC
977 Gahanna Parkway
Columbus, OH 43230
USA
Telephone:
+1 614.861.1304
+1 800.545.4157
Fax:
+1 614.864.2069
www.adb-airfield.com
