- Chapel Hill, NC
- Retired Electrical Contractor
The switch for the heaters is a duplex. You can turn each element on or off separately. So that’s why the 5 wire application. In case you want them to be on separate circuit with separate double pole brakers. At least that’s how I understand the diagram.
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The diagram says stack switch but you are correct- 2 dp switches would work fine and no 4 pole breaker tie necessary