WORKSPACE / NEW ESTIMATE
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01

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02 / SOR CATALOGUE

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03 / YOUR ESTIMATE

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ITEM / DESCRIPTIONQUANTITYAMOUNT
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G Type reference template · Original SOR wording

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Electrical design assistant

SOR-only suggestions · fixed 30 m per segment · circuit drop limit 2% · sub-main drop limit 1%

Fixed one-way design distance: 30 metres for each circuit and for the sub-main. Calculations apply to this assumed route; actual longer routes need a separate check.

Add SOR items room by room. Items with the same circuit group in a room share a circuit. Use separate groups for dedicated equipment. Power factor is fixed at 0.9 for every item. Input watts means electrical input, not AC cooling capacity or motor shaft output.

This applies consolidated quantities of the listed room SOR items to the chosen section. Existing quantities of those items are replaced; unrelated SOR items stay unchanged. Wiring suggestions are added separately after review.

Calculation method & remaining checks

Connected load = quantity × electrical input watts. Demand factor is 100%; no automatic diversity or spare margin. PF is fixed at 0.9 as a project assumption. Single-phase I = W / (V × PF); three-phase I = W / (√3 × 415 × PF). Main current uses the highest phase current with real/reactive load summed per phase. A three-phase row assumes a balanced load. Three-phase sub-main screening includes the calculated fundamental neutral current, using (highest phase current + neutral current) × length × (R+X) relative to phase voltage. Harmonic neutral current is not included.

Wire shortlist is a voltage-drop screen, not a current-capacity selection. Copper screening uses R = 0.0225 / area Ω/m, X = 0.00008 Ω/m and ΔV ≤ k × I × 30 × (R+X), k = 2 or √3. Separate screening budgets: sub-main 1%, circuit 2%. Combined path is shown. These are planning assumptions, not a declaration of code compliance. Earth and neutral arrangements, cable ampacity/derating, starting current, trip curve, fault level, disconnection and selectivity remain to be checked. A SOR rate covering an ampere range does not specify an exact purchased rating.

Voltage-drop method · Protection selection checks