UPS installation and commissioning in Toronto
A new UPS is sized from the measured load, placed where it can be cooled and serviced, connected by a licensed electrical contractor, started to the manufacturer's procedure and tested under load before it carries anything critical. The handover file records every setting and test result, so the first maintenance visit has a baseline to compare against.
Key facts
- Electrical connection in Ontario: a licensed electrical contractor [1], with an ESA notification of work [2]
- Topology for critical loads: VFI, double conversion: output unaffected by input voltage and frequency swings[3]
- Batteries on site: charged within six months of shipment if stored at 25 °C or cooler (EnerSys)[4]
- Warranty: some three-phase warranties require the manufacturer's own start-up (Eaton)[5]
- Acceptance test: load steps, a battery discharge and bypass transfers[6]
Sizing review
Nameplate ratings are maximums. A UPS sized from them is oversized, runs at low efficiency and costs more in batteries than it needs to.
| Input | Where it comes from | Why it matters |
|---|---|---|
| Real load | Measured at the panel, or a logged reading from the existing UPS | Sets the kW and kVA rating |
| Growth | Your rack and equipment plan | Spare capacity, or modules to add later |
| Runtime | How long the load must run before the generator takes it, or before a clean shutdown | Sets the battery string |
| Topology | The load and the site’s power quality | VFI for critical loads [3]; VI, which holds output in a tolerance band without the battery, only where the load accepts it [7] |
| Redundancy | How much downtime the site accepts | N, N+1 or 2N |
| Room | Floor loading, clearances, cooling | Battery cabinets are the heaviest item in the room |
| Input | Supply voltage, breaker sizes, generator | The generator must hold voltage and frequency for the UPS to accept it |
Installation and start-up
- Survey the delivery route, floor, clearances, supply and cooling.
- Place the UPS and battery cabinets and assemble the battery racks.
- Connect through a licensed electrical contractor, to the installation manual and the Ontario Electrical Safety Code [1].
- Check before power: torque, phase rotation, input voltage, battery polarity.
- Start up to the manufacturer’s procedure: settings, firmware, battery charge [5].
- Test under load, then hand over.
Batteries delivered early lose charge on the floor. CSB rates its VRLA self-discharge at about 3% a month at 25 °C [8], and EnerSys allows six months from shipment to the first charge at that temperature [4]. Their date of arrival goes in the handover file.
Acceptance tests
| Test | What it proves |
|---|---|
| Load steps on a load bank | Output voltage and frequency hold at each step up to the agreed load [6] |
| Battery discharge | The UPS goes to battery and back under load [6] |
| Transfer to bypass and back | The static switch and the maintenance bypass work under load |
| Alarm and shutdown signals | Contacts, network card traps and emails reach your monitoring |
| Settings record | Output voltage, alarms, battery settings and firmware written down |
Replacing an existing UPS
The swap is planned so the load is unprotected for as short a time as possible. A temporary UPS or the maintenance bypass carries it while the old unit is disconnected and the new one is started and tested. The old unit and its batteries leave the site with the crew and go to recycling.
Common questions
How is a commercial UPS installed?
Survey the site, size the UPS from the measured load and runtime, place it with its clearances and cooling, have a licensed electrical contractor connect it [1], start it to the manufacturer's procedure, then test it under load before it carries the critical load.
Do I need an electrician to install a UPS in Ontario?
A hard-wired UPS is connected by a licensed electrical contractor [1], and almost all electrical work is reported to ESA through a notification of work [2]. A plug-in rack UPS needs neither.
What is UPS commissioning?
Proof that the installed UPS works as designed before it carries the load: start-up, load steps, a battery discharge, bypass transfers and alarm signalling, all recorded in the handover file.
Does the manufacturer have to start up a new UPS?
Some do: Eaton's three-phase warranty depends on start-up by an authorized Eaton engineer or agent [5]. Check the warranty for your model before booking start-up.
What size UPS do I need?
Size from the measured load in kW and kVA plus planned growth, then pick the battery runtime for how long the load must run without utility power. Send the load list through the request form for a sizing review.
Sources
- Government of Ontario, O. Reg. 570/05: Licensing of Electrical Contractors and Master Electricians, s. 3
- Electrical Safety Authority, Notifications and Inspections, Notifications
- U.S. Department of Energy, Energy Conservation Program: Test Procedure for Uninterruptible Power Supplies (final rule), footnote 12, section 2.27.2
- EnerSys, Safety, Storage, Operating and Maintenance Manual, VRLA Battery Systems (US-VR-OM-002), section 4, storage
- Eaton, Limited Factory Warranty for Eaton Three-phase UPS, PDU, RPP, STS Products, THIS WARRANTY IS NOT VALID (a)
- Eaton, Load Bank Testing Scope of Work (Attachment L-6), steps 9 to 17
- U.S. Department of Energy, Energy Conservation Program: Test Procedure for Uninterruptible Power Supplies (final rule), footnote 13, section 2.27.3 of appendices Y and Y1
- CSB Energy Technology, VRLA Battery User Manual (Operation and Handling, Rev Dec 2024), storage
Updated