In the FIDIC Silver Book (both editions), the Notice of the Commencement Date will be...

Comprehensive and Detailed Explanation:

In the FIDIC Silver Book (1999 and 2017 editions), which is tailored for EPC/Turnkey contracts, the Employer is responsible for notifying the Contractor of the Commencement Date (Sub-Clause 8.1). Unlike other FIDIC contracts where the Engineer might notify commencement, the Silver Book places more responsibility on the Employer due to the nature of the contract where the Contractor is largely responsible for design and execution with fewer Engineer roles.

The Employer’s formal notification of the Commencement Date signals the official start of the Contractor’s obligations and triggers timelines under the contract.

The Engineer or Resident Engineer typically does not issue such notice in the Silver Book framework.