Power Load Assessment for a Clinic: Reading a Real-World Example

The power load assessment determines the actual electrical demand a clinic must sustain at full activity. A flawed assessment produces either a dangerous undersizing (panels that trip at peak load) or costly oversizing (equipment sized for demand that never materialises). The method rests on three steps: inventorying loads, applying realistic simultaneity factors, and building in an evolution margin.

Step 1 — Inventory every load

Every piece of equipment counts, with its actual rated power: medical imaging, sterilisation, technical room air conditioning, surgical lighting, clinical IT. Reserve outlets sized for not-yet-identified equipment are added systematically — clinics almost always acquire new equipment in the years following opening.

Step 2 — Apply realistic simultaneity factors

Not all equipment runs at full power simultaneously. An operating theatre and a sterilisation unit rarely both operate at 100 percent capacity at the same time as the full imaging suite. Applying a simultaneity factor by zone — rather than simply adding every rated load — prevents a panel oversized by 30 to 40 percent, paid for demand that never occurs in practice.

Step 3 — Add the evolution margin

A clinic evolves: new equipment, space extensions, changes in clinical activity. The 15 to 20 percent margin added to the initial load balance corresponds to the typical addition of one or two significant items — additional imaging equipment, a supplementary steriliser — within the first five years, without touching the main electrical panel.

What this method produces in practice

On healthcare facilities designed this way, the built-in margin has absorbed new diagnostic equipment added a year after commissioning — without any intervention on the main panel, no rework cost, no disruption to clinical activity.

Frequently asked questions

Who should produce the power balance for a clinic?
A specialist engineering firm or technical integrator, before execution drawings are finalised — not the executing electrician alone, who generally doesn't have full visibility into the planned clinical activity.

Is a clinic's power balance different from a standard office?
Yes — the simultaneity factors and critical loads (operating theatre, sterilisation) are specific to healthcare and have no equivalent in a standard commercial building.

Can a power balance be redone after construction?
Yes, but undersizing discovered after the fact requires panel replacement — more expensive and more disruptive than correct sizing from the start.