Solicitation Attachment 1 Salient Characteristics.pdf
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- Attached to
- 3-Phase Step Down Transformer
- Solicitation number
- N0024426Q0094
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Salient Characteristics Summary
This document is an attachment specifying mandatory and optional technical requirements for a custom-built, marine-grade, three-phase step-down transformer required by the Naval Postgraduate School, Physics Department.
Product Requirements
The Naval Postgraduate School requires one 3-phase step-down isolation transformer for use in a Naval Conex box aboard civilian research vessels. The transformer must convert 480 VAC, 3-phase, 50A input power (with accommodation for 440 VAC and 460 VAC alternates) to three outputs: two 115 VAC, 3-phase, 30A outputs and one 115 VAC, 1-phase, 30A output. The transformer must be 27 kVA or higher, EMI shielded, copper wound, approximately 3% impedance, and comply with MIL-T-15108C (mandatory requirement). Each output requires 30A fusing with a primary 50A slow-blow or anti-surge fuse. Wiring must use 6 AWG SIL-A-BLEND 200C/1000V for input and 8 AWG SIL-A-BLEND 200C/1000V for output, with MS17344 and MS17346 connector compatibility. The enclosure must be NEMA 4, marine grade, with a 50°C ambient temperature rating, 115°C temperature rise, and 200°C insulation rating. The transformer must include casters, lifting eyes, removable locking casters, a reinforced underside for crane/forklift movement, and be compatible with shipboard grounding (open-delta configuration) and deck mounting/securement.
Delivery and Submission Requirements
Delivery is required within 8 months after contract award to the NPS Warehouse in Monterey, California, with deliveries restricted to Monday-Friday, 0700-1130 and 1230-1600 PST. Quoters must provide comprehensive technical documentation including manufacturer name and part number, product literature, electrical specifications, connector/interface details, grounding/bonding details, enclosure information, mechanical configuration, dimensions, weight, and evidence of MIL-T-15108C compliance with any exceptions noted. Failure to provide sufficient documentation renders offers technically unacceptable. Technical acceptability requires meeting all mandatory requirements with supporting documentation for verification.
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| File | Type | Posted |
|---|---|---|
| Solicitation Questions and Answers.pdf | ||
| Solicitation Questions and Answers.pdf | ||
| Solicitation - N0024426Q0094.pdf |
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Text version
Attachment 1: Salient Characteristics
3-PHASE STEP-DOWN TRANSFORMER
Requiring Activity: Naval Postgraduate School Department: Physics Department Quantity: 1 Each Requested Delivery Date: Delivery is required within 8 months after date of award
1. PURPOSE
The Naval Postgraduate School requires one custom-built, marine-grade, three-phase step-down transformer for use in a Naval Conex box environment aboard civilian research vessels. The transformer shall support safe and reliable operation in a shipboard/marine environment and shall meet the minimum technical requirements identified in this attachment.
2. GENERAL REQUIREMENT
The transformer shall support operation of a Naval Conex box used for physics research aboard civilian research vessels. Civilian research vessels generally provide 480 VAC or 440 VAC, 3-phase power, while the Conex box requires three 115 VAC multi-phase inputs. The transformer shall be suitable for shipboard deck use and compatible with the electrical, environmental, grounding, and mechanical requirements stated herein.
4. MANDATORY SALIENT CHARACTERISTICS
4.1 Electrical Requirements
The product offered shall:
1. Be a 3-phase step-down isolation transformer.
2. Be EMI shielded.
3. Be 27 kVA or higher.
4. Have input power of 480 VAC, 3-phase, 50A.
5. Have multiple output power connections (e.g., 115 VAC, 3-phase, 30A).
6. Accommodate common alternate input voltages, including 440 VAC and 460 VAC.
7. Have approximately 3% impedance.
8. Be copper wound.
9. Meet MIL-T-15108C. This is a mandatory requirement.
4.2 Input/Output Configuration
The product offered shall:
1. Support the Conex box input arrangement consisting of:
• Two 115 VAC, 3-phase, 30A outputs
• One 115 VAC, 1-phase, 30A output (2 hot and 1 ground)
2. Provide three outputs through a distribution arrangement.
3. Fuse each output at 30A.
4. Primary fuse, such as slow-blow or anti-surge fuse, for 50A
5. Use input wiring compatible with 6 AWG SIL-A-BLEND 200C/1000V or better.
6. Use output wiring compatible with 8 AWG SIL-A-BLEND 200C/1000V or better.
7. Maintain required conductor color coding as specified by the requiring activity.
8. Use the required connector/interface configuration or a fully compatible equivalent if approved by the Government (e.g., MS17344 and MS17346)
4.3 Grounding and Bonding
The product offered shall:
1. Be compatible with the required shipboard grounding arrangement, i.e., OPEN-DELTA
2. Provide bonding between the ship ground/hull ground, transformer grounding bus, and chassis as specified by the requiring activity.
3. Provide grounding support for the Conex box output arrangement.
4. Use a green ground conductor.
5. Accommodate the backup chassis-to-ship ground braid arrangement specified by the requiring activity.
4.4 Thermal Requirements
The product offered shall be rated for:
1. 50°C ambient temperature
2. 115°C temperature rise
3. 200°C insulation rating.
4.5 Mechanical and Environmental Requirements
The product offered shall:
1. Be marine grade.
2. Have a NEMA 4 enclosure.
3. Include casters.
4. Include lifting eyes.
5. Include a reinforced underside suitable for crane or forklift movement and shipboard securement.
6. Include removable locking casters for movement across deck and through ship access points.
7. Be suitable for ship deck mounting and securement.
8. Be compatible with the required deck mounting arrangement identified by the requiring activity.
5. OPTIONAL CHARACTERISTICS
The following characteristic is optional and not required for technical acceptability:
1. Labeling or operating guidance indicates operation in shaded conditions rather than direct sunlight.
6. DELIVERY REQUIREMENTS
6.1 Delivery Date
Required delivery date: Delivery is required within 8 months after date of award
6.2 Delivery Location
NPS Warehouse 1988 Lake Del Monte Drive -- Building 349 Monterey, CA 93943
Deliveries shall be made Monday through Friday between 0700-1130 and 1230-1600 PST. The contractor shall include the Government contract number on the package and/or packing slip.
7. PRODUCT SUBMISSION REQUIREMENTS
Quoters shall provide sufficient technical documentation for the Government to determine compliance with all mandatory salient characteristics. At a minimum, the quoter shall provide:
1. Manufacturer name
2. Manufacturer part number
3. Product literature / cut sheet
4. Electrical specifications
5. Connector/interface details
6. Grounding/bonding details
7. Enclosure/environmental rating information
8. Mechanical configuration information
9. Dimensions and weight, if available
10. Evidence of compliance with MIL-T-15108C
11. A list of any exceptions
Failure to provide sufficient documentation may render the offer technically unacceptable.
8. TECHNICAL ACCEPTABILITY
A quotation shall be considered technically acceptable only if it meets all mandatory requirements of this attachment and includes sufficient supporting technical documentation to verify compliance.
Dated: 08/25/2026
File details come from the government source that posted it. Updated .