🛡️ UL 1449 Type 1 / Type 2 SPDs (100 kA - 300 kA per Phase), Voltage Protection VPR

Commercial Surge Protective Device (SPD) Calculator

Size facility cascaded surge protection under UL 1449 5th Edition & NEC Article 242: calculate maximum surge discharge current rating (100 kA to 300 kA per phase using thermally protected metal oxide varistors TPMOV), Voltage Protection Rating (VPR <1,000V clamping), service entrance Type 1 vs panelboard Type 2 SPDs, and electrical margins.

1. Project & Operating Inputs

Facility Distribution Panels Protected (Panel Count e.g. 18 Panels)

Surge Current Capacity (kA / Phase e.g. 200 kA per Phase Heavy Duty)

Customer Bid Price for Supplied & Installed SPD ($ / Panel e.g. $2,450)

UL 1449 Type 2 SPD, Disconnect Breaker, Metal Conduit & Electrician ($ / Unit)

2. Financial Breakdown & Yield

UL 1449 SURGE PROTECTION (SPD)

Turnkey Facility SPD Package Profit

Surge Protection Supply Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost