The Second-Hand Mixed Tower
A site has an old mobile tower bought second-hand. The frames carry a stamp from a withdrawn product standard and no BS EN 1004 label; the platforms are new and marked as complying with BS EN 1004-1. The tower is to be used at a 4.0 m platform height for a 20-minute gutter repair. The site manager wants to combine the old frames with the new platforms because the spigots 'fit well enough'. There is no instruction manual for the frames, but a photocopy of a manual for a different make of tower is in the site office. The ground is firm paving, and the tower will be next to a wall, so only three sides need guardrails according to one worker. The new starter asks whether the tower is compliant and whether the missing fourth guardrail is acceptable.
1. What product-standard issues arise with the old frames and new platforms?
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Mobile access towers should be supplied as a matched system with a product label, a declaration of conformity to the current standard and an instruction manual. The frames are marked with a withdrawn standard and have no BS EN 1004 label, so their design, load capacity and compatibility with current components cannot be confirmed from the equipment itself. The new platforms may comply with BS EN 1004-1, but that does not make them compatible with old frames from a different system. A manual for a different make of tower is not a substitute because it will describe different components, locking arrangements, stabiliser requirements and maximum heights. The site manager's view that the spigots 'fit well enough' is not a technical assessment. Unless the frame manufacturer can confirm in writing that the specific combination is permitted, the tower should not be assembled or used as a compliant mobile access tower.
2. Can the tower be used with guardrails on only three sides because it is next to a wall?
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No. A mobile access tower needs a complete guardrail system around every platform side from which a person or material could fall. A nearby wall is not a guardrail: it may be at the wrong height, it may have openings or projections, and it does not provide a continuous toe board or a defined top and intermediate rail. The incomplete fourth side also affects the tower's use because the platform edge is unprotected when the tower is moved or when the user works near that edge. The correct configuration should be taken from the manufacturer's manual and should include top rails, intermediate rails and toe boards on all sides, with the access opening controlled. If the tower is positioned so close to the wall that a guardrail cannot be fitted, the tower should be relocated rather than leaving the side unprotected.
3. What should the new starter recommend as the compliant way forward?
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The new starter should recommend that the old tower is not used until its status is properly established. The practical options are: obtain the original manual and written confirmation from the frame manufacturer that the frames comply with BS EN 1004-1 and are compatible with the new platforms; replace the old frames with a complete matched tower system; or hire a compliant tower for the task. The chosen tower should have a legible label, a manual, the correct load class for the work and all guardrails and toe boards needed for a 4.0 m platform height. A competent person should inspect it before use and record the inspection. For a 20-minute gutter repair, a short hire of a known compliant tower is likely to be simpler and safer than trying to certify a second-hand mixture with no paperwork.