Calculator #008Cable sizingLV, up to 1000 V a.c.IEC 60364-5-52

LV Cable Sizing Calculator — current-carrying capacity, up to 1000 V a.c. / 1500 V d.c. (IEC 60364-5-52)

Scope: low-voltage installations per IEC 60364-1, 11.2 a) - nominal voltage up to and including 1000 V a.c. or 1500 V d.c. Cables rated 1 kV to 36 kV are outside this scope and are rated from IEC 60502 tables or an IEC 60287 calculation instead. Preliminary LV cable section selection from IEC 60364-5-52:2009 Annex B tables. The built-in example pins Annex E.52.2: 39 A with a four-core PVC copper cable clipped to a wall selects 6 mm2; with harmonic derating 39 / 0.86 selects 10 mm2.
Developed by the ieccalc.com engineering team
Questions and corrections — forum
1 · Environment
Utility design practice, not IEC. Fills the three fields below; all stay editable.
Table B.52.14, base 30 C — rates every method in air.
Table B.52.15, base 20 C, at the depth of the cable — rates D1 and D2.
Table B.52.16, base 2,5 — applies to the buried methods.
523.5 — rated on the lowest temperature present.
2 · Load
IEC 60038:2009, Table 1.
524.1 mechanical minimum — it can only raise the section.
Drives, UPS, LED and discharge lighting.
Sized on the neutral current 3 × h3 × I.
3 · The cable
From the equipment library

Nothing picked. The calculation runs on the values entered by hand.

By hand — what Annex B keys on
Table 52.1 temperature limit.
The section being checked.
These four — conductor, insulation, loaded conductors and section — are everything Annex B needs; the rating, the temperature limit and the correction factors follow from the tables. The rest of a data sheet does not change them.
4 · Installation

Every length of the run whose conditions differ is a section with its own tab. IEC 60364-5-52:2009, 523.8 sizes the conductor for the most adverse of them — block 7 says which.

Route length only; it does not change the rating.
523.8 NOTE.

Pick the installation being built. All 48 of IEC 60364-5-52:2009 Table A.52.3 are here; the letter on a card is the reference method the standard rates that installation by. The two rows of filters are ours — a finding aid built from the wording of the items themselves.

Pick an installation above.

Only where this trench differs.
5 · Derating factors

What turns the tabulated rating into the rating of this run. Only the correction tables that the reference method of block 4 is rated by are shown, and every value is a tabulated column of the table beside it — the standard has a run between two columns rated on the next column up, so there is nothing to interpolate.

Empty = the site value of block 1.
B.52.17 NOTE 2 — no group reduction.
523.7; on D1/D2 counted as m circuits, B.52.18/19 NOTE 3.
With the circuit use of block 2, sets the 524.1 mechanical minimum.
Left out of the group count, 523.5.
The group the factor is read for, IEC 60364-5-52, 523.5 and 523.7
Result
6 · Further checks

Current-carrying capacity is one requirement of several. The plan below is drawn from what you entered; untick anything the project covers elsewhere.

7 · Summary of the route
#SectionLength, mMethodGroup Medium, CSoilCaCgCsC Iz table, ACorrected Iz, ASection required, mm2
PRO - batch schedule and report

FREE performs one complete feeder check, with as many route sections as the run has. PRO adds multi-feeder schedules and shared editable reports.

Glossary
Built-in validation tests
#CaseExpectedComputedStatus