Illinois Power Distribution Estimating Services
Heavy Division 26 electrical takeoffs for service entrances, switchgear lineups, substations, feeder bus ducts, and primary distribution in Illinois.
Heavy Power Infrastructure in Illinois
Power distribution forms the critical electrical backbone of every commercial facility, industrial complex, and institutional campus. In Illinois, contractors must accurately capture large-scale service gear, transformer heat losses, fault current ratings, and heavy feeder conduit pathways.
Our power systems estimators examine utility point of delivery requirements, service entrance vaults, main switchboards, dry-type step-down transformers, and motor control centers (MCCs). We apply localized trade labor units that account for heavy rigging, core drilling, and high-tonnage wire pulls.
⚡ Utility Coordination Reality
We verify utility transformer pads, metering CT/PT cabinets, and utility fault current availability to ensure switchgear short-circuit ratings are compliant on bid day.
Core Power Systems Disciplines
Heavy Power Distribution Sample Takeoff Schedule
| CSI Division | Power Distribution Equipment | Quantity | Unit | Equipment Specifications |
|---|---|---|---|---|
| 26 12 00 | Primary Substation Transformer (13.8kV - 480V) | 2 | EA | 2500 kVA pad-mounted liquid-filled transformer with secondary throat connection |
| 26 21 00 | Main Service Switchboard (4000A, 480Y/277V) | 1 | EA | 65 kAIC withstand, Main-Tie-Main breaker layout, digital power quality meter |
| 26 24 16 | Power Distribution Panelboards (480V 400A) | 8 | EA | Branch circuit breaker distribution, copper bus, integrated surge suppression (SPD) |
| 26 25 00 | 3200A 3-Phase 4-Wire Copper Feeder Busway | 450 | LF | Indoor sandwich bus duct, spring hanger isolation, and plug-in tap disconnects |
| 26 05 33 | Parallel 500 kcmil Copper Feeder Assemblies | 6,400 | LF | 4x 500 kcmil THHN + ground in 4" Rigid Galvanized Steel (RGS) conduit runs |
Power Distribution Estimating FAQ
How do you calculate switchboard bus sizing and AIC short-circuit ratings in Illinois?
We review electrical single-line diagrams to verify main breaker ratings (1200A to 5000A), bus bar amperages, AIC withstand ratings (42kAIC, 65kAIC, 100kAIC), and required ground fault protection (GFP) per NEC Article 230.
Do you estimate feeder busway runs and large-gauge copper cable pulls?
Yes. Our takeoffs detail busway footage, elbows, tap boxes, and hanger spacing, alongside heavy copper feeder conduit assemblies (500-750 kcmil THHN/XHHW) with realistic labor units for parallel conductor pulling.
How do you account for emergency power generation and automatic transfer switches?
A drawing-based takeoff can measure standby generator installations including sound-attenuated outdoor enclosures, sub-base fuel tanks, exhaust piping, remote annunciators, and dual-source automatic transfer switches (ATS).