Engineering Calculator · 064
Cable Voltage Drop Calculator
Estimate DC voltage drop from current, resistance per length, route length and an explicit current-path factor.
Live calculation
Enter the known values.
Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.
Results
The calculation runs locally in this browser. Values are not submitted or stored by this tool.
Direct answer
What this result means
Estimate DC voltage drop from current, resistance per length, route length and an explicit current-path factor. The relationship ΔV = I rL Kpath ties circuit current, resistance per length, one-way route length, current-path factor and system voltage directly to the reported result. Resistance per length remains constant over the route. Treat the value as a transparent preliminary calculation, then compare it with the actual cable-entry assembly and current product documentation.
Formula & theory
Make the assumptions visible.
ΔV = I rL Kpath defines the calculation shown here. Resistance per length remains constant over the route. Keep the entered units with the result so another reviewer can reproduce the method.
ΔV = I rL Kpath defines the calculation shown here. Resistance per length remains constant over the route. Keep the entered units with the result so another reviewer can reproduce the method.
Variables
Use sequence
From measurement to review
- Confirm circuit current and resistance per length from a controlled drawing, measurement or project document.
- Apply ΔV = I rL Kpath with consistent units and keep the entered values beside the result.
- Use circuit resistance only after checking AC effects, conductor temperature, connections, path convention and the permitted project voltage drop.
Limits
What this calculation does not confirm
- Resistance per length remains constant over the route.
- Inputs describe one defined operating or measurement condition and use mutually consistent units.
- The result does not by itself confirm product suitability, standards compliance, ingress performance or installation approval.
Calculator FAQ
Use the number without losing the engineering context.
These answers clarify what the tool calculates and where a product-specific review still begins.
Product selection support
Connect the calculation with cable-entry product options.
Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.