
Amazon .uk: Electrical Box Grommets
15 Pack M20 20mm IP68 Waterproof Black Cable Glands, Nylon Cord Grip Connectors with Locknut & Washer, Suitable for 6-12mm Cables, Strain Relief Grommets for Outdoor Electrical Wiring Junction
Junction Box Installation & Operation Manual
Two large holes for non-conduited installation: The two large holes, which accomodates PG13.5 cable fittings, are for wiring the Junction Box to the other Junction Boxes and to the controller.
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