Drill And Tap Sizes For Electricians Explained
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How to drill holes in OBO cable trays
The number of drill holes is dependent on the height and width of the cable trays. Recommendation: For side height 60 mm = 4 screws per. The screw-on cable tray systems fulfil the requirements of “IEC 61537:2006 – Cable management ‒ Cable tray systems and cable ladder systems” for the low voltage area. If, after shortening the cable trays, slots for further installation are missing, then suitable fastening holes must be drilled in the cable trays. Covers are available for 45° and 90° bends, angle-adjustable bends, T pieces, add-on tees and cross-overs. It details the use of fittings, including factory-made bends and on-site creations with both small and large radii.
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