CircuitCalc

Supply

Incoming to the enclosure

Project

Enclosure

System

Phases

VoltageL-L

Power factor

Incoming faultbolted

Earth faultblank = 0.85×Isc

Enclosure ambient

°C

Voltage-drop limit

Circuits bunchedTable 22

Main bus

Pass

Construction

Material

Bar size

Bars per phase

Bus length

Incomer rating

Incomer type

Incomer Icu

Bus rating: 450 A
CSA: 300 mm²
Σ Ib: 98.0 A
Isc at bus: 24.5 kA

One-line

AC 415 V · 25.0 kA

Outgoing circuits

Tap a row to size cable, protection and length

Tag	Load	Ib	Device	CSA	L	VD	Isc end	Zs	Lmax
Q1	Lighting — LED battens	12.0 A	MCB Type C 16 A	2.5 mm²	35.0 m	1.46 %	0.69 kA	0.691 Ω	120 m	Pass
Q2	GPO circuit — workshop	12.0 A	MCB Type C 16 A	2.5 mm²	28.0 m	1.16 %	0.85 kA	0.555 Ω	120 m	Pass
Q3	Pump motor DOL	42.0 A	MCB Type C 63 A	16.0 mm²auto	45.0 m	0.97 %	3.15 kA	0.144 Ω	125 m	Pass
Q4	VSD feeder — conveyor	28.0 A	MCCB 32 A	6.0 mm²	22.0 m	0.98 %	2.34 kA	0.197 Ω	88 m	Pass
Q5	24 V control / PLC (from 415 V)	4.0 A	MCB Type C 10 A	1.5 mm²	18.0 m	0.41 %	0.80 kA	0.594 Ω	74 m	Pass

Q1 — Lighting — LED battens

AS/NZS 3008 sizing · AS/NZS 3000 protection & loop

Pass

Tag

Description

Load type

Design current Ib

Protective device

Device rating In

Icu

RCD / RCBO

30 mA

Conductor

Insulation

Cores

Installation

Cable CSA

PE conductor

Route length

Grouping overrideblank = supply

Selected CSA

2.5 mm²

Iz derated

16.8 A

base 21 · kt 1.00 · kg 0.80

Voltage drop

1.46 %

6.04 V

Isc at origin

24.5 kA

Isc at end of line

0.69 kA

Earth-fault at end

347 A

Zs / Zs max

0.691 Ω

max 1.498 Ω · Ia 160 A

Lmax voltage drop

120 m

Lmax earth-fault loop

77 m

Governing Lmax

120 m

Recommended CSA

2.5 mm²

Pass
Load vs protection
12.0 A ≤ 16 A
Ib 12.0 A is within In 16 A
AS/NZS 3000 cl 2.5.3
Pass
Protection vs cable CCC
16.8 A ≥ 16 A
In 16 A ≤ Iz 16.8 A after derating (kt 1.00 × kg 0.80)
AS/NZS 3000 cl 2.5.3 · AS/NZS 3008
Pass
Breaking capacity
25.0 kA ≥ 24.5 kA
Icu 25.0 kA ≥ prospective 24.5 kA at the outgoing terminals
AS/NZS 3000 cl 2.5.4
Pass
Short-circuit withstand
2.5 mm² ≥ 1.97 mm²
2.5 mm² ≥ 1.97 mm² required (k=115, I²t 51200 A²s)
AS/NZS 3008 adiabatic · AS/NZS 3000 cl 5.3.3
Pass
Voltage drop
1.46 % ≤ 5.0 %
1.46 % (6.04 V) over 35.0 m is within 5.0 %
AS/NZS 3000 cl 3.6.2
Pass
PE conductor size
2.5 mm² ≥ 2.50 mm²
PE 2.5 mm² meets Table 5.1 (2.5 mm²) and adiabatic (1.68 mm²)
AS/NZS 3000 Table 5.1
Pass
Earth fault loop impedance
0.691 Ω ≤ 1.498 Ω
Zs 0.691 Ω ≤ Zs max 1.498 Ω. 30 mA RCD also provides shock protection (cl 2.4.2) — Table 8.1 is not the sole disconnection method
AS/NZS 3000 cl 2.4.2 / 5.7
Pass
Circuit length
35.0 m ≤ 120 m
35.0 m is within Lmax 120 m (VD 120 m)
AS/NZS 3000 cl 3.6 / Table 8.1