Using an extension cable on a reel

Question

Does an extension cable need to be completely unravelled from the reel when it's in use? I've read somewhere that it can melt.

Karolis · Accepted Answer

That is correct! It can melt when its not unreeled fully.

Connor · Answer

Depends what you’re plugging into it, anything with pulling a high load could cause melting

Nick · Answer

Yes they should be, unless it’s an extremely load being pulled then no it won’t melt

Benjamin · Answer

It’s safe practice to do it however, unless you are plugging in very high energy consuming units, it’s unlikely to melt.

Raymond · Answer

Yes, it is highly recommended to fully unwind an extension cable from its reel before using it. Here's why:

Heat Generation: When electricity flows through a cable, it generates heat. This heat needs to dissipate to prevent overheating.

Coiling Effect: When the cable is coiled on a reel, the heat generated is trapped within the coils, making it difficult to dissipate. This can lead to a significant increase in temperature, potentially causing the cable's insulation to melt.

Fire Hazard: In severe cases, the melting of the insulation can lead to a short circuit, which could potentially cause a fire.

Important Considerations:
Cable Rating: Ensure the extension cable is rated for the load you intend to connect.
Reel Type: Some reels have built-in safety features like thermal overload protection, but it's still best practice to unwind the cable.
Short Distances: For very short distances and low-power appliances, a partially unwound cable might be acceptable, but it's always safer to err on the side of caution.

In conclusion, it's generally best to fully unwind an extension cable to minimize the risk of overheating and potential fire hazards.

Luke · Answer

Yes it is best to fully extend the cable as the build up of heat could cause the cable to melt and be a potential fire risk

Marcus · Answer

Yes it does need to be unwound as it will get warm. Electrician.

Ruyaa · Answer

Yeah its always safe to unwind the cable fully , to prevent overheating of the cable

Neil · Answer

Yes it's is true that they can melt if not unwound  fully. But it's also down to the load plugged into it.

A phone charger or a single table lamp is unlikely to make the unit overheat, but a heater or kettle will draw alot more power and when wound on the reel the power going through acts like a transformer and generates heat.

Best advice is always unwind them fully.

Using an extension cable on a reel

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