⚡ NEC 240.87 (Arc Flash Reduction Maintenance Switch ARMS, Slashing Cal/cm² by 85%)

Arc Energy Reduction (ARMS) Calculator

Evaluate incident energy reductions achieved by installing Arc Energy Reduction Maintenance Switches (ARMS / Eaton / Schneider) on circuit breakers rated ≥1,200A under NEC Article 240.87: calculate clearing time reduction (bypassing intentional time-delays during maintenance to trip instantaneously in <50 ms, slashing incident energy from 45 Cal/cm² down to <4 Cal/cm²), and electrical retrofit yields.

1. Project & Operating Inputs

Main Low-Voltage Breakers Retrofitted (Breaker Count e.g. 6 2,000A Breakers)

Baseline Arcing Duration (Seconds e.g. 0.45 Seconds Time Delay Trip)

Customer Bid Price for Supplied, Landed & Tested ARMS System ($ / Breaker)

Electronic Trip Unit Upgrade, Remote Lockable Switch, Secondary Injection ($)

2. Financial Breakdown & Yield

NEC 240.87 ARMS RETROFIT

Turnkey ARMS Switch Retrofit Profit

Substation Electrical Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost