Do you really mean an RCD?
What is the size of protective device (fuse or contact breaker) for the cable
What size cable (if any) is in place between the consumer unit and the shower position?
Complete answers will help the next round of 'advice'
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local