Electrical
What this tool does
Ampacity by size, metal, temperature column, ambient, and conductor count. This page says what the tool is for, in plain language. The working formula stays on the signed-in tool.
When to use it
Open Conductor ampacity when this is the job: Ampacity by size, metal, temperature column, ambient, and conductor count. That is usually a loop, a conductor, a raceway, or a barrier you are about to accept or reject.
Step-by-step
- Open Conductor ampacity from the tool list.
- Fill Units, Size, Metal, Temperature column from the instrument, the drawing, or the job record. Use the unit shown beside each field.
- Fill the remaining fields the same way. Skip a field only when the screen marks it optional.
- Run Calculate when that control is on the page, then read every result row and any warning.
- Check the result against the site procedure and the manufacturer data before you change a range, a wire, a setpoint, or a weight.
- This help page is public. Opening the tool still requires a Pro session.
Inputs
- Units
- Imperial or metric. Pick one and enter every other field in that system.
- Size
- Choose the Size that matches the instrument, the drawing, or the job. Choices include 14, 12, 10, 8, 6, 4.
- Metal
- Choose the Metal that matches the instrument, the drawing, or the job. Choices include Copper, Aluminum.
- Temperature column
- Choose the Temperature column that matches the instrument, the drawing, or the job. Choices include 60°C, 75°C, 90°C.
- Ambient
- The temperature around the conductors, not the temperature inside the insulation table's base column.
- Current-carrying conductors
- Current-carrying conductors is the value you read from the instrument, the drawing, or the job record.
- Load
- The current the circuit is expected to carry.
Results
- Result
- The reported value for Conductor ampacity. Use the unit printed on that row.
- Warnings
- A warning means an entry is incomplete or outside what this tool will stand behind. Recheck the inputs and the site procedure.
Common mistakes
- Using the wrong metal, the wrong insulation column, or a one-way length where the circuit is a round trip.
- Comparing barrier and device parameters that are not from the same certificate columns.
- Applying a fill or ampacity table to a raceway or a wire the table does not cover.
- Do not treat a result from Conductor ampacity as a substitute for the site procedure or the manufacturer data.
Standards references
These are the standards and public references named on this tool. Clause numbers appear only when the catalog already cites them.
- NFPA 70 (2023) Table 310.16
- NFPA 70 (2023) Table 310.15(B)(1)
- NFPA 70 (2023) Table 310.15(C)(1)
- NFPA 70 (2023) 240.4(D)
Offline and access
This engine can run offline after the server has cached it for the signed-in account.
A free session can read this help page. The tool card shows the name and the short summary. Opening the tool requires Pro.