Cable tray expansion joints, etc
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GB 50303-2015 Code for Acceptance of Construction Quality of Building Electrical Engineering 11.2.1 When the length of rigid or plastic ladder trays, pull trays, and trunking in straight sections exceeds 30 meters, or when the length of ladder trays, pull trays, and trunking made of aluminum alloy or fiberglass-reinforced plastic exceeds 15 meters, expansion joints shall be installed； Compensation devices should be installed when ladder frames, trays, and trough boxes cross deformation joints. 11.2.2 When ladders, trolleys, and trough boxes are fixed to rigid supports, anti-electrochemical corrosion measures that ensure insulation between them shall be in place. When working on site, how are expansion joints, compensation devices, and electrochemical corrosion dealt with?
Expansion joint: Some modifications can be made at the bridge deck connection plates; by changing the bolt holes on one side of these plates into elongated holes, expansion is possible. Cable tray manufacturers can supply cable tray expansion connectors directly