Iran Nezam Electrical Design Exam study plan

Compute connected and demand loads for a 6-storey residential building using diversity factors, and tabulate results per feeder and per phase.

Size main and sub-panelboard busbars and incoming breakers for the calculated demand, selecting standard frame ratings.

Balance single-phase loads across the three phases of a distribution board and calculate the resulting neutral current.

Produce a one-line diagram showing the main board, sub-boards, and feeder ratings for the same building.

Select conductor cross-sections for each feeder using current-carrying capacity, correction factors for ambient temperature and grouping, and derating tables.

Calculate voltage drop for each feeder at full load and verify it stays within the permitted percentage at the furthest point.

Choose cable routing methods (tray, conduit, buried) for each feeder and justify the choice against installation conditions.

Size the neutral and protective conductors for each circuit and state the rule applied.

Calculate prospective short-circuit current at the main board and at the furthest sub-board using transformer impedance and cable impedance.

Verify that breaker breaking capacity and let-through energy are adequate at each board.

Design the earthing system: earth electrode type, earthing conductor size, main equipotential bonding, and supplementary bonding in wet areas.

Check discrimination between upstream and downstream protective devices for at least three fault levels and adjust settings where needed.

Map each design decision from weeks 1-3 to the relevant clause of the national building electrical code and record the clause number.

List the mandatory inspections and tests required before energizing a new installation, with acceptance criteria.

Identify code requirements for wet locations, bathrooms, kitchens, and common areas and note where the week-1 design must be revised.

Summarize the roles and liabilities of the designer and supervisor under the national regulations.

Perform lumen-method illuminance calculations for an office, a corridor, and a parking area, selecting luminaires and maintenance factors.

Verify calculated illuminance against the recommended maintained levels for each space type.

Lay out luminaires on a reflected ceiling plan and check uniformity and glare control.

Calculate the lighting load for each space and add it to the load schedule from week 1.

Size a distribution transformer for the building load, including spare capacity and derating for altitude and ambient temperature.

Select and size a standby generator for essential loads, and define the automatic transfer scheme and its changeover time.

Design the emergency lighting and exit-sign circuit so it transfers to the generator or battery supply within the required time.

Calculate generator fuel consumption and starting capacity for the largest motor load.

Design a fire detection system for a commercial floor: detector type and spacing per area, manual call points, and sounders.

Calculate sound pressure levels at the furthest point and verify audibility above ambient noise.

Draw the fire alarm zone and loop wiring diagram and specify cable types with fire-resistance ratings.

Integrate fire alarm cause-and-effect actions with the transfer scheme, lifts, and smoke control from week 6.

Assemble a complete design documentation set: drawings index, specifications, calculation book, and bill of quantities.

Write technical specifications for cables, boards, transformers, and the fire alarm system using standard clauses.

Prepare a supervision plan listing inspection hold points, test records, and handover documents.

Complete two timed mock exams covering all ten domains and review every wrong answer against the source clause.