Electrical Estimating Guide: Branch Wiring, Switchgear, and Lighting

By Waqas Malik, CPE

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.