Can I Pair Two Phase Converters Together?
Yes — two rotary phase converters can be operated on the same single-phase service, each powering separate equipment or load groups. Here is how to do it correctly.
Two Converters on the Same Service
Each converter requires its own dedicated single-phase circuit and breaker. They share the same L1 and L2 utility feed but operate independently — each generating its own L3. This is perfectly acceptable and common in larger shops.
Can I Gang Two Converters to Power One Large Load?
No — two converters cannot be paralleled to share a single three-phase output. Each converter generates its own L3 phase at a slightly different angle, and connecting two L3 outputs together creates a phase conflict that will damage both converters and the load.
When Do You Need Two Converters?
- Your total HP load exceeds 100 HP (largest single converter available)
- You want to isolate sensitive equipment (CNC) from dirty loads (welders, compressors)
- Equipment is in separate buildings or areas, each needing its own converter
Sizing Two Converters
Size each converter independently based on the equipment it will power. Apply the correct load multiplier for each group of equipment. Call (800) 417-6568 — we can help you plan a two-converter shop layout.
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Two Converters — FAQ
Can two phase converters share the same utility panel?
Yes — each converter gets its own dedicated circuit and breaker from the panel. They share L1 and L2 utility legs but operate completely independently.
Can I use two converters to get more HP capacity?
Not in parallel on one load — that causes phase conflict. Each converter must power its own independent load group. For loads over 100 HP, call us to discuss options.
Do both converters need to be the same brand/size?
No — each converter is sized independently for its own load group. They can be different HP ratings and different series.
Related Articles
- How to Size a Rotary Phase Converter
- What Is a Rotary Phase Converter?
- Rotary vs Digital Phase Converters
- Phase Converter FAQ
Questions? Talk to an engineer.
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