Commerical Electrical Load Calculation

Code-Compliant Load Calculations for Safe, Scalable Power Distribution in Commercial Buildings

Whether you’re planning a panel upgrade, adding new equipment, expanding operations, or submitting plans for permit approval, an accurate electrical load calculation is essential. At Second Opinion Electric, we provide detailed commercial load calculations that ensure your electrical system meets current demand, supports future growth, and complies with the National Electrical Code (NEC) and local jurisdiction requirements.

Our licensed electricians and estimators use standardized NEC formulas and real-world demand assessments to help you size new service panels, add dedicated circuits, or confirm whether your current infrastructure can handle upcoming loads.

Why Accurate Load Calculations Matter

Prevents overloading panels or transformers
Avoids equipment damage due to voltage drops
Helps with panel sizing, breaker selection, and conductor sizing
Required by permitting authorities, engineers, and utility companies
Avoids costly redesigns or delays in build-outs and inspections
Ensures long-term safety and efficiency of your power system

What We Provide

NEC-compliant demand load calculations using standard or optional methods
Site-specific load assessments based on current and planned usage
Circuit-by-circuit analysis of existing electrical panels
Calculations for service entrance sizing (100A–800A+)
Subpanel sizing and distribution balancing
Support for multi-tenant buildings, restaurants, medical facilities, and more
Utility coordination for service upgrades or meter stack requirements
Documentation for permit submissions or plan review

When You Need a Load Calculation

Planning a new commercial build-out or tenant improvement
Upgrading a main panel or service entrance
Installing large appliances or HVAC systems
Adding EV chargers, kitchen equipment, or IT infrastructure
Expanding operations, adding square footage, or changing building use
Submitting electrical plans for permitting or inspection
After a failed inspection due to lack of load verification

NEC-Based Methodology

We follow all relevant NEC guidelines, including:

NEC Article 220 — Branch-circuit, feeder, and service load calculations
Optional and standard methods, depending on occupancy and building type
Consideration of continuous vs. non-continuous loads
Demand factors for general lighting, receptacles, and HVAC loads
Proper application of multipliers for fixed equipment and special occupancies

Load Calculations for

Office buildings and multi-tenant retail
Restaurants, cafés, and commercial kitchens
Medical, dental, and imaging clinics
Warehouses and workshops
New construction and renovation projects
Permit resubmittals or design build-outs

Why Choose Second Opinion Electric?

Licensed and insured electricians with commercial experience
Familiar with local utility, inspector, and permitting authority requirements
Clear, well-documented reports suitable for submission and review
Fast turnaround and support for plan revisions or inspection responses
Free second opinions on existing contractor load sheets or failed plan sets

Let’s Get Started

All Services

Contact with us for any advice

Need help? Talk to an expert

813-716-6020

Get a Load Calculation You Can Build On

Whether you need to verify existing capacity or plan for expansion, let our experts deliver the precise numbers you need — fast, accurate, and to code.

Residential Electrical Services

Commercial Services