Explain what is changing
Identify whether the job is a new installation, replacement plant, a control change or investigation of a fault. Explain what the system currently does and the intended operation. A description of the problem and when it occurs is often more useful than an assumption about which component needs replacing.
Identify the equipment
Provide manufacturer names, model numbers, electrical requirements and the equipment locations. Include boilers, pumps, valves, ventilation equipment and associated control panels where relevant. Photographs can help establish the arrangement, while manufacturer information and drawings provide the detail needed to plan the electrical work.
Agree the control requirements
Share the controls description or sequence of operation if available. The contractors need to agree supplies, enable signals, fault signals and any control references required by the actual equipment. Existing terminals or wire colours alone do not establish the requirements for replacement equipment. Responsibilities should be agreed against the current technical information.
Coordinate the site work
Confirm who provides the equipment, who installs it mechanically and who is responsible for electrical wiring and controls configuration. Agree plant availability, isolation and access. If several contractors are involved, establish how questions and changes will be recorded so the work follows the same agreed requirement.
Set out testing and handover
Agree whether joint testing is required and which contractors need to attend. The proposal should explain the electrical checks and any drawings, schedules or other records included. Record changes to the original plan and keep the relevant equipment information with the completed installation records.