Residential and retrofit
Point by point: circuits, outlet layout, lighting, basic automation, distribution board with RCD protection properly sized.
- Typical load: 6 to 20 kW
- Delivery: 7 to 10 business days
- Includes: ART record
Electrical design
Complete electrical design, low to medium voltage
An installation that works, gets approved and never turns into a waste well. Designed from real load, with calculation, specification and build details the electrician can execute without improvising.
Scope
Design types I sign
Each type needs a different level of detail. I pick the scope from what the site requires, not from what sells more drawing sheets.
Commercial and retail
Store, clinic, office and restaurant: demand per area, feature lighting, power for refrigeration and fit-out compliance with the mall.
- Utility standard
- Optional AVCB report
- Night works schedule
Industrial and medium voltage
Service entrance, transformation, busbars, motor control centres, motor starting, reactive compensation and discrimination proven by study.
- Discrimination study
- Busbar thermography
- Commissioning support
Condominium and common areas
Sub-metering, pumping, stair pressurisation, emergency lighting, concierge and infrastructure for vehicle charging.
- Fair per-unit splitting
- NBR 17019 applied
- Room for the future
Generation and chargers
Integration of photovoltaics, storage and EV charging into the existing board, without rework later on site.
- Utility homologation
- Real cable sizing
- Surge protection
As-built and compliance
Rebuilding the design from what was actually installed, for sale, financing, insurance or operating licence.
- Survey with metering
- Paperwork for authorities
- 5 to 12 days
Deliverables
What lands in your hands
No "CAD file and good luck". The package is complete and written for three audiences: whoever builds it, whoever approves it and whoever pays for it.
Standard design package
- Drawing sheets in stamped PDF plus editable DWG file
- LV single-line diagram (and MV where transformation exists)
- Layout of sockets, switches and luminaires
- Load schedule with demand, diversity factor and installed power
- Written specification with sizing criteria and material schedule
- Quantified bill of materials for tendering
- Earthing, bonding and lightning protection details
- Board index for physical circuit identification
- Design ART record filed with the council
Coordination included
I cross-check the design with architecture, structure and hydraulics before issuing. Ducts crossing a beam and luminaires colliding with a sprinkler are found here, not on site.
Standards applied
The technical base of the design
The standards cited in the specification are exactly the ones behind every calculation decision.
| Standard | What it settles in the design | Where it shows up |
|---|---|---|
| NBR 5410 | Low voltage installations: installation methods, grouping factors, protection and minimum cross-sections | Conductor and protection sizing |
| NBR 14039 | Medium voltage installations (1 kV to 36 kV): clearances, isolation and switching | Service entrance and transformation |
| NBR 5419 | Lightning protection: level, air terminals and earthing | LPS and bonding |
| NBR 15647 | Substations above 36 kV | Higher voltage projects |
| NBR 17019 | Vehicle charging infrastructure in buildings | Garage and charger |
| NR-10 | Safety in electrical installations and services | Work plan and execution |
| ANEEL access group rules | Distributor requirements for approval of the service entrance | Utility filing |
The list can change with the local distributor rules — which is why the specification always cites both the standard and the requirement of the approving body.
Design + ART + site support
Method
Sizing twice: for the standard and for the bill
A circuit that passes calculation can still be an expensive circuit. I check voltage drop at real load, starting currents, harmonics from switched supplies and the reserve the building will need over the next ten years.
- Load survey room by room, never by generic floor area
- Voltage-drop criterion tuned to how the board is actually used
- Physical and electrical reserve for future solar generation
- Protection curves coherent with motor starting
- Standardised circuits to make future maintenance cheap
Next step
Send the architecture plan and get the design proposal
I need the plan in PDF or DWG, the intended use per room and, if it exists, the utility orientation letter. Within 4 business hours you get scope, timeline and price.
Frequently asked questions
What is the lead time for an electrical design?
Residential usually ships in 7 to 10 business days. Commercial 10 to 15. Industrial with medium voltage depends on switching complexity and the discrimination study: 15 to 30 business days. The timeline is agreed in writing in the proposal.
Do you issue an ART for the design?
Yes, the design ART is filed and sent with the package. A report carries its own ART; they serve different purposes and a single project may need both.
Does the design replace the structural calculation?
The electrical design is independent and complete. Where structural calculation is already contracted, I coordinate with it; openings and sleeves that affect structure are agreed with the structural lead.
Can everything be done without a visit?
For new build, yes: the architecture is the base. For retrofit, extension or as-built, the metered survey is what guarantees quality — and then I schedule the visit.
What if the utility asks for changes?
I revise the design at no extra cost within the same scope. Requests to change the delivery point or protection are routine, and following the approval is part of the delivery.
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Learn moreWhy an electrical design lowers total build cost
The design fee is a small fraction of the installation cost — yet it decides conductor size, number of circuits, board dimensions and contracted demand. Without a design those calls get made on site, under deadline pressure, with whatever the local supplier has in stock. The usual outcome is oversized cable where it was not needed, undersized circuits where it was, and a board with no reserve at all.
With a design, materials are bought from a list, the crew works from one readable diagram and inspection finds documentation. On average, material savings between an unbuilt-without-design site and a quantified one cover the designer fee, and utility approval stops being a schedule risk.
- Correct sizing avoids conductor replacement after the building is finished
- Well tuned discrimination reduces total blackouts from a single fault
- Board space and ampere reserve is cheap today, expensive later
- A specification standardises material across tender suppliers
What changes between residential, commercial and industrial work
Residential aims at comfort and safety with the fewest useful circuits. Commercial brings in contracted demand, on-peak tariffs, feature lighting and landlord requirements. Industrial becomes a continuity problem: discrimination, motor starting, harmonics, reactive compensation and a maintenance plan that survives a fault.
Talk to the technical lead
Let us size your savings before the design is signed off
Typical reply within 4 business hours · Worldwide from Brazil