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.
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.
B.52.6 to B.52.9 — 500 V rows stop at 4 mm2.
The column of the mineral table.
B.52.6 and B.52.8 NOTE 2 — times 0,9.
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 6 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.
Picked above; the list is the same 48 items in one drop-down.
Table B.52.20 / B.52.21 axis.
Empty = the site value of block 1.
Only where this trench differs.
Derating factors this installation is rated by
Only the correction tables that apply to the reference method above are shown.
Every value is a tabulated column of the table beside it.
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.
Result
5 · 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.
6 · Summary of the route
#
Section
Length, m
Method
Group
Medium, C
Soil
Ca
Cg
Cs
C
Iz table, A
Corrected Iz, A
Section 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.