What Is Electrical Contracting?
Electrical contracting is the turnkey undertaking—by a single engineering company—of the design, material procurement, installation, testing, and commissioning stages of a building, factory, hotel, shopping mall, or industrial facility’s electrical infrastructure. It is a holistic service covering low voltage (LV) and medium voltage (MV) systems, switchboard manufacturing, cable pulling, lighting, grounding, power factor correction, and low-current systems. In Türkiye, it is a legal requirement that TEDAŞ/BEDAŞ-approved projects be carried out by an authorized electrical engineer.
Scope of Electrical Contracting Services
A professional electrical contracting company undertakes all or part of the following items depending on the project scale:
1. Low Voltage (LV) Contracting – 0–1 kV
- Design and manufacturing of LV distribution switchboards
- Lighting installation, LED luminaire installation, DALI / KNX automation
- Sockets, switches, cable duct and cable tray systems
- Grounding and lightning protection (lightning rod) systems
- Installation of reactive power compensation panels
2. Medium Voltage (MV) Contracting – 1–36 kV
- Installation of TEDAŞ/BEDAŞ-approved transformer substations (oil-immersed/dry-type transformer)
- MV cell (circuit breaker, disconnect switch, metering) installation
- MV cable pulling, termination, and splicing (3.6/6 kV – 20.3/35 kV)
- Protection relays (ANSI 50/51/27/59) and SCADA automation
- Energy authorization, provisional/final acceptance processes
3. Low-Current Systems
- Fire detection and alarm system (TS EN 54 compliant)
- CCTV security camera and NVR/DVR recording system
- Card access, turnstile, and access control
- Structured cabling (Cat6 / Cat6A / fiber optic)
- Public address and sound systems, intercom
Electrical Contracting Project Process
- Site Survey and Needs Analysis: Site inspection, load analysis, existing infrastructure report.
- Project Design: AutoCAD and DIALux drawings, single-line diagram, short-circuit calculation.
- Approval Process: TEDAŞ/BEDAŞ project certification, EMO approval, building inspection coordination.
- Material Procurement: Original products from brands such as ABB, Schneider, Siemens, Legrand.
- Installation and Pulling: Switchboard installation, cabling, luminaire installation by authorized technicians.
- Testing and Commissioning: Insulation, earth resistance, thermographic testing, and functional checks.
- Provisional Acceptance and Warranty: Legal provisional acceptance, 2-year warranty, periodic maintenance agreement.
How Is the Cost of Electrical Contracting Calculated?
Cost is determined by facility size (m²), installed power (kW), number of panels, cable length, number of luminaires, and the quality of the brands used in the system. In general, pricing is 800–2,500 TL/m² for LV systems on a per-square-meter basis, while MV systems are priced separately on a project basis. For accurate budgeting, you should definitely obtain a quote after a detailed site survey.
How to Choose the Right Electrical Contracting Company
- EMO and TEDAŞ authorization certificates: An MV project cannot be carried out without official authorization.
- Engineering staff: At least 1 electrical / electrical-electronics engineer is required.
- Reference projects: Request completed projects of a similar scale.
- Occupational safety certificates: Certificates such as ISO 45001, OHSAS should be sought.
- Material quality: A commitment to A-class brands should be provided in writing.
- Warranty and maintenance: At least 2 years workmanship warranty and periodic maintenance service.
DOA Enerji Electrical Contracting Service
DOA Enerji Aydınlatma, based in İstanbul Başakşehir, provides turnkey electrical contracting services for factory, shopping mall, hotel, hospital, and residential projects as a TEDAŞ/BEDAŞ-approved electrical engineering and contracting company. It has 20+ years of experience in LV distribution switchboard manufacturing, MV transformer substation installation, LED lighting design, and low-current systems. For a free site survey and quote, you can reach us at +90 212 945 0 362.
Frequently Asked Questions (FAQ)
What should I pay attention to when choosing an electrical contracting company?
EMO authorization certificate, TEDAŞ approval, insured engineering staff, reference projects, and an A-class brand commitment should be checked. Do not accept a quote without a written site survey report and a detailed quantity takeoff list.
What is the difference between LV and MV contracting?
LV (Low Voltage) covers voltage levels between 0–1 kV, while MV (Medium Voltage) covers 1–36 kV. MV projects require transformer substations, MV cells, and TEDAŞ/BEDAŞ approval, whereas LV projects include distribution switchboards, lighting, and socket installations.
How long does an electrical contracting project take?
3–4 weeks is typical for a 500 m² office, 8–12 weeks for a 5,000 m² factory, and 12–20 weeks for MV projects with transformer substations. Project duration also includes material procurement time and the TEDAŞ approval process.
Which certifications are mandatory for electrical contracting?
EMO (Chamber of Electrical Engineers) authorization certificate, TEDAŞ/BEDAŞ project authorship, SMM (Independent Consulting Engineering) certificate, and occupational safety certificates (ISO 45001) are mandatory. For MV, an additional high-voltage authorization certificate is required.
How does the electrical contracting price vary by square meter?
As of 2026, it is 800–2,500 TL/m² for LV systems, and 2,500–4,500 TL/m² for projects with mid-level automation. For MV projects, the price is calculated not per square meter but based on installed power (kVA) and transformer capacity.