6 guides · Konoz technical team
Technical guides for site engineers
Questions we hear on site every day, answered from the Saudi code SBC 401 and international standards, with sources in every guide. The numbers are engineering background; the final decision is the project engineer’s.
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01 · 5 minAir-conditioner cable size: how many mm² do you need?
How to size cables for split and central AC units in Saudi Arabia: start from the nameplate current, match the breaker, derate for heat, check voltage drop.
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02 · 5 minHow many amps can 2.5 mm² wire carry? Wire and cable ampacity table
Ampacity of copper wires 1.5–35 mm² by installation method per SBC 401 and IEC 60364-5-52, with Saudi heat and grouping factors, for 2.5, 4 and 6 mm².
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03 · 5 minWhat size breaker for an AC unit, and why does it keep tripping?
How to size an AC breaker from the nameplate and cable, B vs C vs D curves, RCD points, and the usual reasons an AC breaker keeps tripping.
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04 · 5 minElectrical load calculation under the Saudi code SBC 401
Electrical load calculation for a villa or apartment under SBC 401: load schedule, demand factors, phase balance, main breaker and cable, worked example.
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Choosing the right cable size: current, voltage drop and installation method
Cable sizing step by step: design current, installation method, heat and grouping factors, voltage-drop formula with a worked example, short-circuit and earth.
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06 · 3 minHow to prepare an electrical BOQ that gets priced faster
How to build an electrical BOQ: core columns, the specification each item needs, mistakes that delay pricing, and how to send it to Konoz on WhatsApp.
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