How to 90 degree bend cable tray? For a 90-degree bend, ensure the tray's internal radius meets the cable's minimum bend requirement. Common standards are 300, 450, 600, and 900 mm., 10x for. OBO BETTERMANN has offered prod-ucts and solutions for electrical instal-lation for over 100 years. With our many years of experience, we are one of the leading manufacturers in this field. Establishing partnerships. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. With traditional cutting and bending, each drop can take over four hours to complete. Material choice T&B channel tray systems are fabricated from a corrosion-resistant metal (low-carbon steel, stainless steel or an aluminum alloy) or from a metal with a corrosion-resistant finish (zinc or epoxy).
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