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Electrical engineering student · Adelaide

Nathan No-ot

Power systems and grid integration

I design to AS/NZS standards and publish the working, so please feel free to check it.

Currently
Electrical Engineering Intern, Tindo Solar
Since
Aug 2026
Studying
Associate Degree in Electronics Engineering, TAFE SA
Articulating
BE Electrical & Electronic, Adelaide University (expected 2028)
Availability
South Australian internships
View projects Résumé PDF (PDF, opens in a new tab)
Commercial LV cabling design - one-line diagram Redrawn one-line diagram of a 400 V three-tenancy commercial complex: a 500 kVA transformer feeds the main switchboard through 25 mm squared X-90 copper consumer mains, and the switchboard supplies a communal finals group and the supermarket, hairdresser and butcher distribution boards. The consumer mains carry a design current of 123.6 A at 0.74 per cent voltage drop against the 1 per cent limit set by the project brief, and the 125 A Type C main switch clears the 8.0 kA prospective fault current within its 10 kA breaking capacity. 500 kVA transformer 400 V three-phase supply PFC 15 kA at transformer Consumer mains - 15 m buried, separate conduits, trefoil 25 mm² X-90 Cu (A, N) + 6 mm² E Ib 123.6 A ΔV 0.74 % MSB 125 A COMMUNAL SUPERMARKET HAIRDRESSER BUTCHER 40 A 25 A 50 A 6 mm² V-75 6 mm² V-75 10 mm² V-75 Main switch 125 A Type C · 8.0 kA fault MEN at neutral bar finals @ MSB SUP-DB HAI-DB BUT-DB communal lighting · HWS final subcircuits · 1.5–4 mm² · Type C · 30 mA RCD LV CABLING DESIGN - THREE-TENANCY COMPLEX One-line diagram · AS/NZS 3000:2018 · AS/NZS 3008.1.1:2025 Figure D.1 · redrawn schematic · not to scale
Open the full-size diagram (opens in a new tab)

Supply · 500 kVA · 400 V 3-ph

Supply capacity S = 500 kVA · U₀ = 400 V · I_psc = 15 kA. Maximum demand: AS/NZS 3000:2018 Cl 2.2.2(a), Table C2 diversity; 85.6 kVA on the heaviest phase (Ib 123.6 A).

Consumer mains · 25 mm² X-90 Cu · Ib 123.6 A

I_b = S_demand / (√3 · U₀) with S_demand = 85.6 kVA; I_b ≤ I_n ≤ I_z with I_z from AS/NZS 3008.1.1:2025 Table 3.8 → Table 3.13 Col 19 (buried trefoil); corrections per Cl 3.4.3.

Voltage drop · ΔV 0.74 % vs 1 % brief limit

ΔV = √3 · I_b · L · R_c / 1000 ≤ 1 % of 400 V (project brief). AS/NZS 3000:2018 Cl 3.6.2 sets the 5 % installation limit.

Main switchboard · 125 A Type C · 8.0 kA fault

I_n = 125 A Type C; I_psc 8.0 kA ≤ 10 kA breaking capacity per Cl 2.5.4.2(a). EFLI: Cl 5.7.3, Table 8.1.

Supermarket submain · SUP-DB · 40 A · 6 mm² V-75

Submain: same chain; Table 3.8 → Table 3.12 Col 17 (one conduit). ΔV adds to the path budget against Cl 3.6.2's 5 %.

Hairdresser submain · HAI-DB · 25 A · 6 mm² V-75

Submain: same chain; Table 3.8 → Table 3.12 Col 17 (one conduit). ΔV adds to the path budget against Cl 3.6.2's 5 %.

Butcher submain · BUT-DB · 50 A · 10 mm² V-75

Submain: same chain; Table 3.8 → Table 3.12 Col 17 (one conduit). ΔV adds to the path budget against Cl 3.6.2's 5 %.

Commercial LV cabling design - 400 V, three tenanciesOpen the case study

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