Under California's Title 24 solar-ready requirements, new residential construction must include conduit and space for future solar photovoltaic systems. What is the minimum conduit size required from the main electrical panel to the roof?
Correct Answer
A) 1 inch
California Title 24, Part 6, Section 110.10 requires a minimum 1-inch conduit from the main electrical panel to the roof area designated for future solar installation. This solar-ready requirement ensures California homes can easily accommodate photovoltaic systems to meet the state's renewable energy goals and building decarbonization objectives.
Why This Is the Correct Answer
California Title 24, Part 6, Section 110.10 requires a minimum 1-inch conduit routed from the main electrical panel to the designated roof area for future solar PV installation. This solar-ready provision ensures new homes can accommodate PV systems without major retrofit work, supporting California's renewable energy and decarbonization goals.
Why the Other Options Are Wrong
Option B: 1-1/2 inch
1-1/2 inch conduit exceeds the minimum requirement. While larger conduit would accommodate more wiring, the code specifies 1 inch as the minimum — using 1-1/2 inch is permissible but not required.
Option C: 3/4 inch
3/4 inch conduit is below the required minimum. It is too small to accommodate the conductors needed for a solar PV interconnection and does not meet the Title 24 solar-ready standard.
Option D: 1-1/4 inch
1-1/4 inch is between the required minimum and an oversized option. It does not correspond to the code-specified minimum of 1 inch and would not be the correct answer for a minimum-size question.
Memory Technique
Solar-ready = 1 inch minimum. Think: '1 sun, 1 inch.' The conduit is a single dedicated pathway from panel to roof — and that single pathway must be at least 1 inch. Also: 1 inch is a common threshold in many California-specific code minimums.
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