📐 UL 857 / IEC 61439-6 (Short-Circuit Withstand 35-100 kA RMS, Seismic Hanger Support Span)

Busway Short-Circuit Withstand (SCWR) Calculator

Calculate electrodynamic magnetic repulsion forces ($F = rac{mu_0 I^2}{2 pi d}$) generated between copper busbars during maximum short-circuit faults under UL 857 & IEC 61439-6: verify Short-Circuit Withstand Rating (SCWR 35 kA to 100 kA RMS symmetrical), calculate seismic hanger rod support spacing (5 to 10 feet), and structural bracing yields.

1. Project & Operating Inputs

Prospective Fault Current (kA RMS e.g. 65 kA Symmetrical Fault)

Hanger Support Span (Feet e.g. 8.0 Foot Trapeze Hanger Spacing)

Customer Bid Price for Supplied & Engineered Seismic Bracing Kit ($)

Unistrut Seismic Cable Braces, Hilti Anchors, Certified PE Stamped Calc ($)

2. Financial Breakdown & Yield

UL 857 SCWR WITHSTAND

Turnkey Seismic Busway Bracing Package Profit

Structural Electrical Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Direct Cost