Thank you for contacting Prysmian Group UK Technical Support.
We recommend that you consult a qualified electrician who will be able to assess your current installation to determine whether adding an additional load is achievable. We suspect that the bathroom light will be a negligible load, but it is still necessary to ensure that the correct installation practice is used that will prevent the load exceeding the maximum rating of the cable. Please refer to BS7671, "Requirements for Electrical Installations" for further details.
Answered by: Nikki - Prysmian
Date published: 2021-05-16