Cable protection in drop keels
If the transducer is installed in a drop keel, the transducer cables must be protected.
Each cable must be fitted with a protective hose. The protective hose starts inside the transducer. Protection must be used along the entire length of the cables, and all the way up to where the cables penetrate the hull.
Note
The protective is hose is fitted to the transducer cables during the production. For this reason, the length of the hose must be specified when you order the transducer.
The transducer cables must be properly fastened at the bottom of the drop keel, and fully supported while lowering and hoisting the drop keel. Proper arrangements must be made to handle the cable slack when the drop keel is in its upper position. Depending on the drop keel design, the cable slack can be kept on the outside of the drop keel, or inside it.
The cables must be permitted to move freely when the drop keel is lowered and hoisted. It is important to avoid sharp edges or protruding elements, as these may cause damage to the cables. Observe the limitations for the cable minimum bending radius. Any damage to a cable may cause water ingression. Water follows the cable cores into the transducer, and causes damage that can not be repaired.
Note
Wherever the cables are unprotected outside the drop keel, use a flexible conduit for protection.
Observe the cable specifications and limitations.
•  Quantity: 25
•  Length:
–  Maximum: 30 m
–  Minimum: 15 m
The transducer cables can not be spliced. The required length of the cables to fit each specific installation must be determined before the transducer is ordered.
•  Cable outer diameter:
–  Without protective hose: 16 mm (Minimum)
–  With protective hose: 22 mm (Minimum)
•  Weight:
–  Transducer: 250 kg (Without cables)
–  Transducer cables: 8,75 kg/m (Without protective hose)
–  Transducer cables: 12,5 kg/m (With protective hose)
–  Total weight: 382 kg (15 m)
•  Minimum bending radius:
–  Static: 95 mm
–  Dynamic: 243 mm
•  Tensile strength: 3000 N
•  MaterialPolyurethane (Outer sheet)