Licensed electrical engineer: low-voltage cabling for LED lighting systems -- 2

We design, manufacture and distribute permanent architectural LED lighting systems that are installed on residential and commercial buildings throughout the United States.
To support our continued growth, we are engaging an experienced electrical engineer to independently evaluate and recommend the most suitable wiring solutions for our installations.
Our systems operate at 24V and 36V DC and use a three-conductor configuration comprising positive, negative and digital data lines, supplemented by dedicated power-injection runs.
These cables are routed through garages, interior walls, attics and soffits before terminating in exterior aluminum lighting tracks.
The tracks are mounted both beneath protected roof eaves and along fully exposed rooflines, where they are subject to rain, condensation, prolonged UV exposure and extreme temperature swings.
Your primary task will be to identify flexible, stranded-copper cables, ideally 16/3 or 16/4 for combined power and data and 14/2 for power injection.
We welcome well-reasoned alternative constructions if they offer superior performance, durability or value.
We expect you to research manufacturers and specific products independently rather than relying on a single distributor's catalog. For every recommended cable, you will verify the UL or ETL listing, the applicable cable-type marking and full compliance with NEC Article 725 and its corresponding provisions in the 2023 NEC.
You will also confirm each product's suitability for in-wall, attic and wet-location use, along with its moisture resistance and sunlight resistance. In addition, the assessment should document rated operating temperatures, minimum installation temperatures for cold-weather work and overall cable flexibility.
Of particular importance is a clear determination of whether our 36V DC circuits in wet, exposed locations remain within Class 2 limits, together with the implications if they do not.
Our objective is to standardize on cost-effective products that are readily available in the US, with at least one qualified alternate for each cable category.
The final deliverable will be a professional written report presenting the recommended cables with their part numbers, verified certifications, approved applications, suppliers and current pricing. The report should include a side-by-side comparison table as well as links to manufacturer datasheets and certification records.
Candidates holding an electrical PE license and proven expertise in NEC Article 725, low-voltage lighting and UL/ETL certification will be given strong preference.