How to Lay Out the Cable Before a Cycle

Lay the cable out first. Don't do it after the robot's in the water. Starting with a clean, straight cable is the habit the guides below keep coming back to.

On the deck first

One maker says to unwind the cable completely before each cycle and place it loosely along the pool edge. Then check for knots, tight loops and twisted sections before the robot goes in¹. Another guide puts it as straightening the cable to remove knots, coils and stored memory that cause twisting in the water².

A cable maker's guide for one robot adds a short reason: twisted cables can restrict movement³.

Switch off and unplug the power supply while you handle the cable, and follow your manual's order of steps.

How much cable goes in the water

This is where most layouts go wrong. Too much cable floats around and gives the robot something to drive over.

One maker gives a rough rule. The useful cable length should cover the diagonal of the pool plus about one metre of extra margin¹. For a rectangular pool, that's the corner-to-corner run. Their example is a pool eight by four metres. The diagonal is around nine metres, so about ten metres of cable is often enough¹.

That rule comes from one maker's blog, not a standard. Your manual may say something different, and it wins.

If your cable is longer than the pool needs, keep the unused part out of the water. The same blog suggests a cable guide or a loose cable tie, not tightened too much, for that unused length only¹. Check your own manual for how to handle spare length. Another guide says to feed in only enough floating cable to reach the farthest point. Keep the excess coiled outside, near the power supply².

Never cut a cable to shorten it. The maker's blog says so directly¹. A cut cable is a damaged cable. Why that matters is covered in the damage checks.

Where the power supply sits

Position affects layout as much as length. One maker suggests placing the power supply near the centre of the pool's longest side¹. That gives the cable room to follow the robot's turns.

But safety comes before tidiness. Keep the power supply where your manual requires, away from standing water⁴. If the manual's distance and your ideal layout disagree, the manual wins. The page on the power supply goes through this.

Putting the robot in

Lower the cleaner into the pool the way the manufacturer describes⁴. Some robots have an adjustable handle with a diagonal setting. One guide says to reverse its direction each use so the cable unwinds between cycles². Does yours have that? The manual will say.

Nobody should be in the pool while the robot runs.

A quick check list

• Cable fully unwound and straight
• No knots, tight loops or twists
• Only the needed length in the water
• Excess coiled on the deck, not tight
• Power supply where the manual says