Electrical Estimating Guide: Branch Wiring, Switchgear, and Lighting

Electrical estimating requires precision across multiple systems — from the main switchgear feeding a building to the final receptacle outlet. Errors in any line item can cascade into significant cost impacts.

Division 26 Scope

CSI Division 26 — Electrical covers:

• 26 05 00 — Common Work Results for Electrical
• 26 10 00 — Medium-Voltage Distribution
• 26 20 00 — Low-Voltage Distribution
• 26 30 00 — Facility Electrical Power Generating
• 26 40 00 — Electrical Panels and Distribution
• 26 50 00 — Lighting
• 26 60 00 — Fire Alarm and Detection

Material Takeoff

1. Conduit and Wire

• Measure linear footage by conduit type (EMT, PVC, RMC, LFMC)
• Count conduit fittings (couplings, connectors, straps)
• Calculate wire footage per conduit fill requirements
• Separate by voltage (120V, 277V, 480V)

2. Distribution Equipment

• Switchgear and switchboards — Current rating (800A-4000A)
• Panelboards — Number of circuits, main breaker size
• Transformers — KVA rating, voltage primary/secondary
• Motor control centers (MCCs) — Combination starters

3. Lighting

• Fixture counts by type (LED troffer, linear, high-bay, wallpack)
• Emergency lighting (battery packs, inverter systems)
• Lighting controls (occupancy sensors, daylight harvesting, dimmers)

Labor Unit Values (NECA)

The electrical industry uses standard labor units from NECA (National Electrical Contractors Association):

• Conduit (1/2” EMT) — 3.5 hours per 100 LF
• Conduit (4” RMC) — 20 hours per 100 LF
• Wire pull (12 AWG) — 2 hours per 100 LF
• Panelboard (42-circuit) — 20 hours each
• Receptacle — 0.8 hours each
• LED troffer (2x4) — 1.2 hours each

Adjust labor units for ceiling height, congested areas, and existing conditions.

F&K Estimatings provides forensic electrical takeoffs with NECA labor unit application. Send us your electrical drawings for a comprehensive bid-ready estimate.