Questions about electrical design, technical reports, ART and service

To renew an AVCB or CLCB, obtain an occupancy permit, release construction credit, satisfy an insurer or close a network audit, yes: it is the document that attests the installation. In a new building what is required is the design with an ART, not a report. The available types are listed under technical reports.

The report is the document itself: methodology, measured values, non-conformities and conclusion. The ART is the council record stating that a qualified professional took responsibility for that object. Neither replaces the other — a report without an ART is usually returned, and an ART without a report tells the inspector nothing.

The standard sets no expiry date: the report describes the installation on the survey date. In practice the fire brigade accepts a recent report in the AVCB renewal cycle, insurers usually ask for a document issued in the last 12 months, and audits request re-testing when works, load changes or a board swap happened after issue.

It is common and does not by itself fail the installation. Each item arrives with its risk grade (critical, high, medium, low), the required action and an estimated cost. Critical items must be closed before the authority inspects, and the re-test of what was fixed carries no new charge within 30 days.

The decision belongs to the inspecting body, so I do not promise approval. What I deliver is the report in the format they review — recorded tests, ART tied to the object, correction plan — and I stay available for clarification during the review, including for the electrician doing the fixes.

No. A report is per address and per object: one building does not cover another, nor the common area when the boards differ. For condominiums I quote per building, at a lower combined price when the whole survey runs in a single day.

Demand is the power the installation draws from the grid, measured in kW over 15-minute intervals. Under the blue tariff you pay the contracted demand whether you use it or not; under the conventional one, a peak inside the on-peak window makes the whole period expensive. Reading the demand curve is the first step of any energy savings plan.

First you confirm with a meter whether the penalty comes from inductive or capacitive reactive power — the correction is the opposite one. The usual route is an automatically switched capacitor bank at the low voltage board, sized with harmonics in mind. Idling motors and old reactor lighting also count: in many retrofits part of the reactive disappears simply by moving to LED and reorganising loads.

NBR 5410 sets no single figure: what matters is the earthing system adopted (TN-S, TT or IT) and the guarantee that protection trips within the useful time. In reports and fire brigade instructions, results in the range of a few ohms are treated as satisfactory, and an interconnected lightning protection grid usually aims lower still. The document records the measurement method next to the value, because that is what gives the number credibility.

NBR 5419 requires a risk assessment: height, occupied area, lightning density of the region, construction type and contents decide whether a system is needed and at which protection level. A tall collective-occupancy building and a warehouse with flammable material almost always call for one; a detached house in a low-strike area may not need it. Where the system already exists, the lightning protection report attests its condition.

A loose terminal, phase unbalance, a busbar with poor contact and a motor pulling above rating all heat up before they fail. The camera shows the temperature difference under real load, letting you retighten a connection during a planned shutdown instead of losing production to a short circuit. Its value depends on recording emissivity, span and load condition at the moment of capture.

In most installations yes, but it depends on the load available at the service entrance, a dedicated circuit with proper residual current protection and spare capacity in the board. A slow 240 V charger needs its own circuit; a more powerful wallbox may require a load increase approved by the distributor. This check happens before specification, not after buying the car.