Specifications

100 – 1000 Amps
SL-20610 (R 11/02) 11
software to communicate (via SNMP and HTTP) to any I.P.-based Ethernet network through a RJ-45
connector. The NIC shall provide redundant paths for communications that make it possible to connect to
a Building Management System (BMS) using Modbus while simultaneously communicating to a NMS
through SNMP and HTTP. A terminal block shall be provided to connect to Modbus.
2.3.6 Remote Source Selection
The STS shall be furnished with Remote Source Selection board to remote select the preferred source.
Closure of one of the two NO dry contacts (by others) shall cause the selected source to be the preferred
source to which the STS will connect the load to as long as the source is available in the same manner as
the local source transfer selection. If both input contacts are closed, the current selected preferred source
shall be retained. The unit preferred source selection and remote source selection shall be active at the
same time, with the STS following the last request for a preferred source change, regardless of whether it
was from the local or remote source select controls.
2.3.7 Key Lockout Switch
A key lockout switch shall be provided which activates a software lockout of the touch-screen display to
prevent manual transfers and configuration changes. When locked out the touch-screen becomes a read
only display, a key is needed to do manual transfers or change settings. The alarm silence button shall not
be disabled when in the lockout position. The switch shall be located behind the front door but can be
operated without opening the front door.
2.3.8 Redundant Output Breaker
A redundant output plug-in non-automatic circuit breaker shall be provided and connected in parallel with
the output plug-in non-automatic circuit breaker to provide redundancy in the output power path. The
redundant non-automatic circuit breaker shall be of the same rating and type as the output breaker.
2.3.9 Input Junction Boxes and Cables
Two input power junction boxes and interconnecting cables shall be furnished for the input power
connections. Power terminal blocks shall be provided in each input junction box for the connection of the
input power conductors and a parity-sized ground conductor. The junction boxes shall be NEMA type 1
enclosure with maximum dimensions of 16 in. (406 mm) width, 30 in. (762 mm) length, and 6 in. (153
mm) height. An input cable assembly shall be provided for connection between the STS unit and the
junction box. The cable length between the unit and junction box shall be 10 feet (3 m) long, and consist
of the appropriate number and size of conductors inside UL/CSA listed liquid-tight, flexible metal
conduit. The conductors shall be UL/CSA listed 90°C minimum insulation, copper conductors, sized in
accordance with the NEC, based on the STS input breaker ampacity.
2.3.10 Seismic Floor Anchors
The STS shall be provided with seismic floor anchors to fasten the unit to a concrete floor to meet seismic
Zone 4 requirements.
2.3.11 Certified Test Report
A certified copy of the factory test report shall be provided for each unit.
2.3.12 Factory Witness Test
The owner and/or the owner’s representative shall factory witness test each unit. The factory will perform
its standard witness test to demonstrate that the unit meets the STS specification.