100 kVA transformer: price, load and use
A 100 kVA transformer serves about 80 kW at 0.8 power factor. It is a common choice for small factories, workshops and residential buildings with lifts and water pumps. Whether 100 kVA is enough depends on how much of the connected load runs at the same time.
- Load it serves
- about 80 kW
- Installed price range
- On written quote
Load it serves
At 0.8 power factor, a 100 kVA transformer delivers about 80 kW. We usually plan for 20–25% headroom so it doesn't run hot at peak and you have room to add machines.
Typical use
Small factory or workshop, a residential building with lifts and pumps.
Installed cost: what you pay for
A 100 kVA quote should list each of these items. If a line is missing, ask why.
- 1
Transformer
Brand, winding material, tested losses, warranty.
- 2
HT side
VCB, RMU or drop-out fuse, HT cable and metering as the utility requires.
- 3
LT panel
Main breaker, outgoing feeders, meters and protection.
- 4
Cables and termination
Correct size for the current, with proper glands and lugs.
- 5
Civil work
Plinth, room or fence, cable trench and oil soak pit where needed.
- 6
Earthing
Separate earth pits for the neutral and the body, tested and recorded.
- 7
Approvals and utility work
OCEI approval and the utility's connection process.
- 8
Testing and commissioning
Insulation, ratio and earth tests, with a written report.
Room and plinth space
At this size the transformer is often pole-mounted, which needs little ground space. If it sits on a plinth, it needs a fenced area with safe clearance. We measure and mark the location at survey.
Approvals needed
- Utility application for the new or increased connection
- Substation design and drawing approval from the Office of the Chief Electric Inspector (OCEI)
- Inspection before the supply is switched on
- Building owner or landlord consent where the site is rented
Frequently asked questions
How much load does a 100 kVA transformer run?
About 80 kW at 0.8 power factor. In practice we keep 20–25% headroom, so plan for a steady demand a little below that.
Can I add more load later?
Yes, if you leave headroom now. If you expect to grow, compare the next size up. A transformer that is far too large still has fixed losses every month.
What approvals does a 100 kVA installation need?
Usually a utility application for the connection and substation approval from the Office of the Chief Electric Inspector (OCEI), followed by inspection before switch-on. We prepare and file the paperwork with you.
Is the price on your quote fixed?
Yes. Our written quote lists every line item with brands and specifications. It only changes if you change the scope.