Concerns with my first test run - please help :/

[Matilda]

Hi all,

I'm running a 50l keg boiler with a 3kw immersion attached to a power controller.
I've had it running for around 20-30 mins and the keg is heating up, which seems positive.

However - my plug, controller and cables are also getting warm. Is this dangerous?

For the sake of testing, I'm running without my condenser attached, and using only water.