A site survey is a visit made before installation by someone who records what is actually there, not what the drawings say. It costs one engineer and a few hours. The alternative is finding out on the day, with kit on a pallet, engineers on the clock and a change window closing.
Why the survey comes first
Many installations stall for reasons unrelated to the technical work. The rack is full, the lift is out of service, the loading bay closes at noon, or nobody on site expects the engineer. Each is visible to anyone who walks the site first. A survey turns assumptions into recorded facts before anything is shipped.
Power and rack space
Confirm power at the rack, not at the room. Record the PDU type, free outlets on each feed, connector types and whether both A and B feeds are live. A server with C19 inlets will not plug into a PDU with only C13 sockets free. Ask the facility whether the cabinet has a contracted power limit.
For rack space, record where the free U positions are, not just how many. Space split across several small gaps will not take a 4U chassis if no single gap is tall enough. Note cabinet depth and rail type.
Cable routes
Trace the path to every device the new equipment connects to. Note whether it runs overhead, underfloor or between cabinets, whether the tray has capacity, and whether crossing into another cage means the facility must run the cable. Record patch panel positions and port types at both ends. LC and MPO connectors are easy to assume and slow to correct on the day.
Access, permits and goods-in
These details differ between sites, which is why a multi-site roll out programme needs a separate survey record for each location.
- Who must be on the access list, how far in advance, and what ID they need.
- Whether a permit to work or method statement must be approved before arrival.
- Goods-in hours, booking references and how long the site will hold kit.
- Loading bay size, lift capacity and door widths between the bay and the data hall.
- Whether packaging can stay on site or must leave with the engineer.
Local contact
Get a name and direct number for someone on site who can escort the engineer, open a cage and answer questions. A generic helpdesk address is not a local contact. Confirm their hours cover the planned window.
Environmental conditions
Note the cooling layout and whether the cabinet sits in a hot aisle or cold aisle arrangement. Some switches draw air front to back and others back to front; mounted the wrong way round, they pull in exhaust air. In comms rooms and back offices, check for dust, heat, water pipes above the cabinet and whether the space locks.
What the survey should produce
The output is a short record per site: photographs of the rack front and rear, free U positions, PDU details, the cable path, access requirements and a named contact. The test is whether an engineer who has never visited could arrive with the right kit, cables and paperwork, and finish without a phone call. If not, the gap is cheaper to close now than on install day.
