PE Conductor Sizing

IEC 60364-5-54 table, adiabatic check with k chosen for the conductor size and installation, and separate Cu/Al PE minimums.

EstimatePreliminary result, not a design verification.

Before you calculate

Protective earth conductor sizing

Compare the simplified same-material sizing table with an adiabatic fault thermal check. The appropriate method depends on installation conditions and protection design.

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Step 1 · Protection conductor

PE conductor sizing

Compare the IEC 60364-5-54 simplified same-material table against an adiabatic short-circuit check (k chosen automatically from the tables, or your own). Confirm the fault current that actually flows through PE and the protective-device clearing energy.

Phase conductor section (mm²)

Phase material

PE material

Insulation

PE fault current (kA)

Effective fault heating time (s)

Adiabatic kAutomatic: k follows the selected conductor's size (PVC above 300 mm² has a lower k) and how the PE is installed. A manual k applies to every size.

PE installation

Step 2 · PE results

Required conductor area

Preliminary standard PE section35 mm²

Adiabatic minimum31.27 mm²

Table method25.00 mm²

Combined screening minimum31.27 mm²

Adiabatic equation

k = 143 for the selected 35 mm² conductor (XLPE/EPR, copper, bunched or in a cable; tables: 143 up to 300 mm², 143 above).

S_{PE}\geq\frac{I\sqrt{t}}{k}=\frac{10.00\cdot1000\sqrt{0.20}}{143.00}=31.27\ \mathrm{mm^2}

Same-material table screening

S_{PE}=\begin{cases}S_{phase}&S_{phase}\le16\\16&16<S_{phase}\le35\\S_{phase}/2&S_{phase}>35\end{cases}

This table requires its prescribed installation and material conditions; not automatically asserted when material or installation conditions differ; adiabatic calculation and separate-conductor minima remain applicable.

Scope and assumptions (1)

Confirm the actual installation-specific k, fault I²t/clearing time, earthing arrangement and protective path. This is a sizing screen, not an installation approval.