Data Center Electrical Estimating Services
Optimar Precon provides data center electrical estimating services for US electrical contractors and general contractors. We take off and price the full power path, from medium-voltage service and switchgear through UPS, generators and busway to the PDUs feeding each rack.
Every estimate follows the designed redundancy topology, keeps vendor gear separate from installation labor, and flags owner-furnished equipment before you submit.
Send Your Electrical Package
Share your single-line diagrams, project location and bid deadline. We will confirm the scope, fee and delivery date with your quotation.
Group-wide figures across all Optimar Precon services.
Eight Data Center Electrical Packages, Estimated Separately
A data center electrical bid is several packages with different units, vendors and labor profiles. Pricing each one on its own keeps high-value gear visible and makes bid leveling against supplier quotes straightforward.
Utility and MV Service
Medium-voltage switchgear, MV transformers, utility interface, duct banks and MV feeders.
26 12 · 26 13LV Switchgear and Switchboards
Main LV switchgear, switchboards, panelboards, breakers and protective devices.
26 24 · 26 28UPS and Battery Systems
UPS modules, battery cabinets (VRLA or lithium-ion), bypass and maintenance bypass cabinets.
26 33Generators and Transfer
Standby generators, paralleling switchgear, ATS/STS units, load bank connections and controls wiring.
26 32 · 26 36Busway and Feeders
Plug-in and feeder busway, parallel cable sets, conduit, cable tray and terminations.
26 05 · 26 25Power to the Rack
PDUs, remote power panels (RPPs), overhead track busway, tap-off boxes and rack whips.
26 27Grounding and Lightning Protection
Ground grids, ground rings, bonding to racks and containment, and facility lightning protection.
26 05 26 · 26 41Monitoring and Low Voltage
EPMS metering and wiring, BMS interfaces, fire alarm and structured cabling pathways where in scope.
26 · 27 · 28We Estimate Along the Power Path, Not Sheet by Sheet
Data center electrical drawings repeat the same equipment across A and B paths, phases and data halls. Tracing each path from utility to rack is the most reliable way to avoid double counts and missed feeders.
1. Reconcile the Single-Line
Equipment on the single-line diagram is matched to the equipment schedules and room layouts, so ratings, quantities and A/B tags agree before counting starts.
2. Count Gear, Measure Feeders
Gear is counted by rating and configuration. Each feeder is measured by route, with conductor size, parallel sets, conduit or busway and terminations at both ends.
3. Multiply by Hall and Phase
One typical data hall or block is built in detail, then extended across halls and build phases, with differences between them priced as adds or deducts.
How Each Electrical Item Is Measured and Priced
Clear units make the estimate easy to check line by line against supplier quotes and your own labor units.
| Item | Takeoff unit | What we capture | Typical cost basis |
|---|---|---|---|
| MV / LV switchgear | Each (by section) | Rating, sections, breakers, bus size | Vendor quote + setting labor |
| Transformers | Each | kVA rating, voltage, type, pad | Vendor quote + rigging |
| UPS modules and batteries | Each / cabinet | kW rating, module count, battery type and runtime | Vendor quote or OFCI install only |
| Generators and paralleling gear | Each | Rating, paralleling sections, controls | Vendor quote or OFCI install only |
| Busway | LF + fittings | Ampacity, elbows, tees, tap-offs, hangers | Material + labor units |
| Feeders (cable + conduit) | LF per set | Conductor size, parallel sets, raceway, pulls | Material + labor units |
| Terminations | Each | Lug size and count at both ends | Labor units |
| PDUs / RPPs / whips | Each | Rating, circuit count, whip lengths | Material + labor units |
| Grounding | LF + each | Grid conductor, rods, bonds, exothermic welds | Material + labor units |
How Redundancy Topology Changes the Electrical Estimate
The redundancy scheme decides how much gear, distribution and switching the bid carries. We price the topology on the single-line, not a rule-of-thumb multiplier.
| Topology | How it works | What it adds to the estimate |
|---|---|---|
| N+1 | One spare unit within each equipment group (for example, one extra UPS module or generator). | Extra units, their connections and controls; a single distribution path in most designs. |
| 2N | Two complete, independent systems (A and B), each able to carry the full load. | Duplicate equipment trains, a second set of feeders, switchgear and PDUs, and more testing. |
| 2N+1 | Two independent systems, each with its own spare unit. | Everything in 2N, plus spare units on both paths. |
| Distributed redundant | Three or more systems share the load so any one can fail (for example, 4-to-make-3). | More systems at smaller ratings, cross-connected distribution and more complex switching. |
| Block / catcher redundant | Several active blocks backed by one reserve block through static transfer switches. | A reserve UPS block, STS units and the reserve bus distribution. |
A Tier III or Tier IV target does not fix the bill of materials on its own. We price the topology shown on the drawings and flag any gaps against the stated resilience criteria.
What Moves Electrical Labor Hours on a Data Center
Material is usually the easier half of the estimate. These factors decide whether the labor holds up.
Heavy Gear Setting and Rigging
Switchgear lineups, transformers and generators need cranes, rigging plans and set sequences priced as their own activities.
Large-Conductor Terminations
Parallel sets of large feeders mean many high-labor terminations at every piece of gear, counted lug by lug.
Busway vs. Cable Routing
Busway installs faster and simplifies tap-offs; cable can be cheaper in material. We price both as alternates when the design allows.
Phased Energization
Halls brought online in phases add temporary power, tie-ins, shutdown windows and remobilization.
Prefabricated Power Modules
Skids and e-houses move labor off site; the estimate shifts to setting, interconnection and site terminations.
Owner-Furnished Equipment (OFCI)
Owners often buy UPS and generators directly. We split OFCI from CFCI so you price installation only where the owner supplies the gear.
Commissioning Levels Carried in the Estimate
Data center electrical scopes usually include contractor support through integrated systems testing. We list which levels are in your scope and price the labor, load banks and standby time for each.
A Division 26 Estimate Your Bid Team Can Check Line by Line
The electrical BOQ follows CSI MasterFormat Division 26 sections, or maps to your company’s own cost codes.
| Section | Title | Typical data center items |
|---|---|---|
| 26 05 | Common Work Results for Electrical | Raceway, cable tray, conductors, grounding and bonding, supports |
| 26 12 / 26 13 | MV Transformers / MV Switchgear | Unit substations, MV transformers, MV switchgear lineups |
| 26 24 | Switchboards and Panelboards | Main LV switchgear, distribution boards, RPPs |
| 26 25 | Enclosed Bus Assemblies | Feeder busway, plug-in busway, overhead track busway |
| 26 32 | Packaged Generator Assemblies | Standby generators and generator controls |
| 26 33 | Battery Equipment | Static UPS systems and battery cabinets |
| 26 36 | Transfer Switches | ATS and STS units |
| 26 41 | Facility Lightning Protection | Air terminals, down conductors, ground connections |
Drawings and Documents We Need
Send what you have; anything missing goes into the scope log as a qualification.
- Electrical single-line and riser diagrams
- Equipment and panel schedules
- Electrical room and data hall layouts
- Specifications (Division 26 and related) and addenda
- Vendor quotes and OFCI equipment list
- Bid form, phasing plan and bid deadline
Electrical Takeoff and Pricing Platforms
Our estimators work in the electrical estimating platforms below, or in the tools your bid team already uses.
Electrical Estimating Support for US Data Center Bid Teams
Project-based estimates for a single bid, or dedicated offshore electrical estimators for contractors with a steady data center pipeline.
Electrical Contractors
Full Division 26 bid estimates, or overflow takeoff when your estimators are stretched across several data center bids.
General Contractors
Independent electrical estimates to check subcontractor numbers, level bids and spot scope gaps before award.
Design-Build Teams
Budget and design-development estimates as the electrical design matures, with alternates for value engineering.
Shashin Gundal
Estimation Lead, Optimar PreconShashin leads Optimar Precon’s estimating team, which prepares electrical and multi-trade packages for US contractor bids.
Your Electrical Drawings Stay Protected
Data center single-lines and layouts are sensitive. Our information handling is certified to ISO/IEC 27001 and ISO/IEC 27701.
Bidding a Data Center Electrical Package?
Send the single-line diagrams and bid deadline, and we will confirm scope, fee and delivery date for your electrical estimate.
Data Center Electrical Estimating FAQs
What does data center electrical estimating include?
It covers the full power path: MV service and switchgear, transformers, LV switchgear, UPS and batteries, generators and transfer switches, busway and feeders, PDUs and rack power, grounding and EPMS. The estimate separates vendor gear from material and labor, and lists testing, commissioning and owner-furnished equipment.
How do you estimate switchgear, UPS and generators?
Gear is counted from the single-line diagram and equipment schedules by rating, sections and configuration. Equipment cost comes from vendor quotes or allowances, and setting, rigging, terminations and testing are priced as separate labor items so the quote and the install can each be checked.
How does redundancy topology affect the electrical estimate?
N+1 adds spare units within an equipment group. 2N duplicates the full system with separate A and B paths. Distributed and block-redundant designs use several smaller systems or a reserve block with static transfer switches. Each topology changes gear counts, feeders and switching, so we price the one on the drawings.
Should a data center use busway or cable, and can you price both?
Busway usually installs faster and makes tap-offs and future changes easier; cable and conduit can cost less in material. The right choice depends on loads, routing and schedule. When the design allows, we price both as alternates so you can compare installed cost.
How do you handle owner-furnished equipment (OFCI)?
Data center owners often buy UPS systems, generators or switchgear directly. We split owner-furnished, contractor-installed (OFCI) items from contractor-furnished (CFCI) items, price installation only for OFCI gear, and list receiving, storage and setting responsibilities in the scope log.
Do electrical estimates include testing and commissioning?
Yes, where it is in your scope. We list which commissioning levels apply, from factory witness testing (L1) through integrated systems testing (L5), and price the electrician support, load banks, temporary power and standby time for each level.
How much does outsourced data center electrical estimating cost?
Project-based estimating starts from $20 per hour. The total depends on the number of data halls, phases, redundancy topology, drawing quality and revisions. You receive a fixed quotation after a scope review, and dedicated electrical estimators are priced as an ongoing monthly resource.
What drawings do you need to start an electrical estimate?
Send the electrical single-line and riser diagrams, equipment and panel schedules, electrical room and data hall layouts, Division 26 specifications, addenda, vendor quotes and the OFCI equipment list. Include the bid form, phasing plan and deadline so the estimate matches how you will submit.
Get a Data Center Electrical Estimate You Can Bid With
Share your electrical package and deadline, and we will scope the takeoff, pricing and delivery date with you.