How can I test a RCD with the PrimeTest 250?

To test an RCD plug or an RCD on an extension lead, you need to plug the RCD plug into the RCD isolator box (NTB 1) and then connect the PT 250 mains lead into the either the socket on the RCD plug or the last socket on the extension lead.

Don't know what you're looking for?
The Seaward PAT tester selector will guide you to your ideal tester, based on some simple questions.
Do you still need help?
Download our free guide to PAT Testing.

Still need help? Ask us.


Stay in the know
Sign up to our mailing list today to stay up to date with the latest industry news and information from Seaward.

I'd like to talk to a sales advisor

Our team of sales advisors are on hand to help you with any queries you have about our products.