Electrical Technical Proposal: Power, Data, and New Installations in Public Contracts
Electrical contracts cover a broad spectrum: power distribution, lighting, sockets, data cabling (VDI, fire safety systems, access control), and increasingly photovoltaic and EV charging (IRVE). The buyer expects precise technical proposals with diagrams, power balance calculations, and verifiable qualifications.
Evaluation criteria for an electrical proposal
The evaluator is typically a technician or consulting engineer. They verify NF C 15-100 compliance, company technical competence (Qualifélec qualification), and staff certifications (NF C 18-510). Technical criteria then cover: power balance justifying installation sizing, single-line and synoptic diagrams demonstrating project understanding, implementation methodology, and commissioning protocol with regulatory tests.
Technical documents that make the difference
A convincing electrical proposal is supported by concrete technical documents.
Diagrams and power balance
The power balance justifies main distribution board and general supply sizing. Present a single-line diagram showing distribution from delivery point to sub-distribution boards, with protection ratings, cable sizes, and breaking capacities. For lighting, a Dialux or Relux calculation for main rooms is a genuine differentiator.
Implementation methodology
Detail cable routing: cable trays, trunking, penetrations, fire barrier crossings, and power/data separation. Explain your labelling and identification plan. For data cabling, specify category (6A minimum for new installations), measurement protocol, and acceptance testing.
Photovoltaic and EV charging: new expected competencies
Photovoltaic self-consumption and EV charging represent a growing share of public electrical contracts. For PV, the proposal must include: yield study, self-consumption diagram, inverter sizing, and ROI calculation. For IRVE: network sizing, OCPP protocol for interoperability, supervision and billing solution, and installation scalability.
Errors to avoid
No diagrams — Without graphical documents, the evaluator cannot judge your technical understanding.
Certifications not mentioned — NF C 18-510 electrical authorisations are mandatory for all personnel. Not citing them is a deal-breaker.
No power balance — Installation sizing must be justified technically.
Forgetting Consuel — The Consuel conformity certificate is mandatory before any commissioning.
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