MP Husky UL & CSA Cable Bus Systems – Aluminum and Stainless Steel Cable Bus Systems are designed for both indoor and outdoor use – Field proven for over 45 years to be the most reliable, cost-effective, flexible and maintenance free, low to medium voltage (600V – 69kV), high amperage (1000A – 8000A) power distribution system available. Compared to Non-Segregated Bus Duct and Bar Bus Duct Systems Cable Bus is less expensive, easier to install, maintenance free, and more reliable.