3-SOW.pdf
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- Attached to
- NMC RP FAA Obstruction Lights | 2097758
- Solicitation number
- 2097758
- Issued by
- Dallas County, Texas
About this file
This is a Scope of Work document for the Dallas Area Rapid Transit Authority (DART) in Texas outlining the procurement of ten (10) complete NMC Powerswitch Rail Powered FAA Obstruction Light Assemblies, model #120410. These units are required for overhead contact system (OCS) structures located between DART Beltline Station and DART DFW Station within protected airspace associated with Dallas-Fort Worth International Airport. The assemblies must maintain FAA compliance for obstruction marking and lighting on structures in aircraft runway approach, departure, and transitional surfaces. The procurement is necessary to provide adequate spare inventory for timely repair or replacement of defective units and ensure uninterrupted regulatory compliance. Substitution with different models or manufacturers is not permitted as it would render existing stocked materials obsolete and negatively impact maintenance efficiency, standardization, and regulatory compliance.
The specifications require FRP NEMA 4X and 3R rated enclosures measuring 22"x10 3/8"x10" with hinged stainless steel door assemblies, 1000VDC knife switch disconnects, 10A traction power fuses, Vigilant Series LED-based RTO L-810 red LED obstruction fixtures rated at 1.5 watts with 12-48 VDC operating voltage, and Absopulse DC to DC converters with 525-975 VDC input converting to 24 VDC output. All units must meet UL 508 and EN50155 standards with specified isolation, immunity, and EMI ratings. DART requires FOB Destination shipping with freight included in the overall price and maintains Net 30 payment terms. Invoices must be submitted in triplicate to APInvoices@dart.org with purchase order number, item description, sizes, quantities, unit prices, and extended totals. Delivery time and rate are essential, and failure to deliver as specified may result in rejection and default termination.
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Other files
| File | Type | Posted |
|---|---|---|
| 1-Purchase Order Terms and Conditions.pdf | ||
| 2-Price Schedule.pdf |
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Text version
NMC Powerswitch Rail Powered FAA Obstruction Light Assembly
DART TES utilizes the NMC Powerswitch Rail Powered FAA Obstruction Light Assembly, model #120410, on all overhead contact system (OCS) structures located between DART Beltline Station and DART DFW Station. These structures are located within protected airspace associated with aircraft runway approach, departure, and transitional surfaces at Dallas-Fort Worth International Airport (DFW). Aircraft operating within these corridors are at lower altitudes during takeoff and landing, and any structure that penetrates or lies in close proximity to this protected airspace is considered a potential aviation hazard and therefore requires FAA-compliant obstruction lighting.
To maintain continued compliance with FAA obstruction marking and lighting requirements and to ensure aviation safety along this corridor, DART requests the procurement of ten (10) complete NMC Powerswitch Rail Powered FAA Obstruction Light Assemblies, model #120410.
These assemblies will provide adequate spare inventory to support timely repair or replacement of defective units and to maintain uninterrupted compliance with FAA standards.
The units DART TES intends to procure must be of the exact form, fit, and function as the units currently in service, specifically the NMC Powerswitch Rail Powered FAA Obstruction Light Assembly, model #120410. Substitution with a different model or manufacturer would result in existing stocked materials becoming obsolete and could negatively impact maintenance efficiency, standardization, and regulatory compliance.
The following specifications must be met:
• FRP NEMA 4X and 3R Rated Enclosure 22”x10 3/8”x10” o Hinged Door Assembly with Stainless Steel Piano Hinge.
o Lockable Padlock Hasp o Quarter turn Latch o 2” Glastic Standoff- 2300 voltage rating / 43.1Kv Short time o Mounting detail 20” x 8” o NEMA 6 Nylon Liquid-Tight Cord Grips ½” NPT for cord diameter .24”-.47”
• 1000VDC Knife Switch Disconnect, Hookstick Operated
• 1000VDC, 10A Traction Power fuse
• Negative Return Block
• Vigilant Series LED Based RTO L-810 Red LED Obstruction Duel Fixture Low Power
FAA Compliant 1.5 Watt / 12-48 VDC Operating Voltage
• Overall Dimension with light assembly 10” x 13.62” x 38.23”
• Absopulse DC to DC Converter. 525 to 975 VDC Input, 24 VDC Output Internally Fused
Product description:
Input Voltage:
o 750Vdc nominal o Operating range 525-975Vdc o Input Current: 0.12A max Input Protection o Inrush current limiting o Varistor o Reverse polarity protection o Internal safety fuse
Isolation o 3000Vdc input to chassis o 3000Vdc input to output o 5600Vdc type test o 1500Vdc output to chassis
Standards o Designed to meet UL 508 and EN50155
Immunity o Meets criteria of EN 50155 and o EN 50121-3-2, including:
o EN 61000-4-2 (ESD) o EN 61000-4-3 (RF Immunity) o EN 61000-4-4 (Fast Transients) o EN 50155 (Surge) o EN 61000-4-6 (Conducted Immunity) o EN 50155 (Voltage Variations)
EMI
o EN55022 Class B
Switching Frequency o 80kHz ± 5kHz
Output Voltage/Current o 24Vdc ± 0.3V/2A continuous o Output is floating, either terminal can be grounded
Line/Load Regulation o ± 1% combined from zero load to full load
Dynamic Response o Max 5% voltage deviation for 10% to 50% load step, with better than 1msec recovery time
Output Ripple/Noise o Better than 70mVrms or 300mVpp (@ 20MHz BW)
Output Overload Protection o Rectangular current limiting with short-circuit protection o Current Limit: 2.3A ± 0.2A
Output Overvoltage Protection o OVP setting: 28V ± 2V o Transzorb clamp, 30V
Efficiency o 80% at full load
Operating Temperature Range o -25ºC to +55ºC for full specification with proper airflow
Temperature Drift o 0.03% per ºC over operating temperature range
Cooling o Natural convection and conduction
Environmental Protection o Ruggedizing Conformal coating
Shock / Vibration o IEC 61373 Cat 1 A&B
Humidity o 5 – 95% non-condensing
MTBF
o 110,000 hours @ 45ºC
Package/ Dimensions (WxHxL) o F1: 114 x 51 x 201mm (4.5” x 2” x 7.9”) Mounting holes are clear
Connections o 9-pole barrier-type of terminal block with 3/8” spacing. Cover provided
File details come from the government source that posted it. Updated .