Marcus Thorne, PE
Senior Thermal & Infrastructure Engineer • ASHRAE Member
Biography & Professional Background
Marcus Thorne is a Senior Thermal and Electrical Infrastructure Engineer at WireSizerPro. Holding a dual background in mechanical thermodynamics and electrical power engineering, Marcus oversees WireSizerPro’s guidance for HVAC equipment[cite: 1, 2], electric heat pumps, air handlers, and residential high-draw circuits[cite: 1, 2].
His 15-year career has centered on thermal dissipation within building envelopes, specifically investigating how high-temperature attic raceways, rooftop conduits, and continuous duty cycles degrade conductor ampacity. Marcus ensures that all WireSizerPro HVAC calculations prevent thermal tripping and comply with manufacturer nameplate ratings.
Primary Focus Areas
- Minimum Circuit Ampacity (MCA) Sizing[cite: 1, 2]
- Maximum Overcurrent Protection (MOP) Limits[cite: 1, 2]
- Attic Ambient Temperature Conductor Derating (NEC Table 310.15(B)(1))
- Dedicated 240V Residential Appliance Branch Runs[cite: 1, 2]
Code Verification Standards
- NEC Article 440: Air-Conditioning & Refrigerating Equipment
- NEC Article 422: Appliances (Water Heaters, Dryers, Ranges)[cite: 1, 2]
- ASHRAE Handbook: Fundamentals & Equipment Systems
- UL 1995 / UL 60335-2-40: Heat Pump Safety Standards