3-part ladder that can be used as both a standing and sliding ladder, providing insulation up to 1000 V AC/1500 V DC. This combined three-part ladder can function as both a step ladder and a sliding ladder. When used as a step ladder, the third upper ladder section serves only as a safety bridge. Optimal stability is ensured by a base traverse, and the sliding ladder is height-adjustable by hand from rung to rung. It features two wall rollers at the top of the ladder, an aluminum locking and opening mechanism, high-strength tension straps to prevent accidental opening of the step ladder, and hollow fiberglass profiles in H-shape (90x32 mm, 70x32 mm for 8 rungs). The aluminum rungs measure: rung cross-section 27x27 mm, rung spacing 280 mm, and it is tested according to EN 131 (except for the 3x14 rung model!). Number of rungs: 3x14. Height of the step ladder: 4.00 m. Maximum height of the sliding ladder: 10.25 m. Weight: 43 kg. This ladder is made of plastic with tested, extremely aging-resistant fiberglass profiles that provide electrical insulation, specifically designed for professional users working near cables, connections, or other live electrical installations. It is lightweight and easy to handle due to the special design of the fiberglass profiles (hollow or C-profile) and aluminum rungs or steps, with rungs and steps permanently double-riveted to the profiles. Rung spacing is 280 mm with a load capacity of 150 kg, and it features slip-resistant rubber ladder shoes. The product includes detailed operating, assembly, and safety instructions. The ladders comply with the European standard EN 131 and electrical tests according to DIN 53 481, 53 482, and 53 483 conducted by the independent testing institute C.E.S.I., with a 5-year durability guarantee.