These tray systems allow excellent ventilation and prevent sagging while routing. They support up to 280 lbs. OBO BETTERMANN has offered prod-ucts and solutions for electrical instal-lation for over 100 years. Establishing partnerships. Our cable tray design considerations guide details key factors to consider when designing cable tray systems for industrial and commercial applications. HDmann. Simple, one-piece steel support tray for e-chain's lower run customized to your required width, height and color.