There has been a misconception in recent times that telescopic ladders are not safe, this is in fact untrue. Telescopic ladders are very safe on the basis that you purchase one that is certified to EN131- 6 from a reputable seller.
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Advantages and Disadvantages of Telescopic Ladders
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Are Telescopic Ladders Safe? - Ladder Review
Are Telescopic Ladders Safe
STEP UP TO SAFE LADDERS
New Safety Guidance Released On Telescopic Ladders