TT electrode and RCD check
Screen the RA × IΔn voltage constraint for a TT system; this is not a complete protection assessment.
Enable JavaScript for live calculations. Read the method and default example below.
Method and assumptions
- RA × IΔn ≤ applicable voltage limit. Convert residual current from mA to A.
Before using the result
- Confirm TT arrangement and the applicable voltage limit. Verify disconnection time, RCD type, coordination, bonding and electrode stability separately.
- This does not verify additional 30 mA protection or certify an installation safe.
Worked example
Illustrative default inputs. Enter your project values above.
- Measured electrode resistance
- 100 Ω
- RCD rated residual current
- 300 mA
- Applicable voltage limit
- 50 V
Default results
- RA × IΔn
- 30 V
- Maximum RA for entered sensitivity
- 166.67 Ω
- Voltage constraint
- Met
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Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.