How can I check if I need to provide a main RCD - Residual Current Device - type B at the head of my installation?

It is always necessary to check whether you need to provide an RCD - Residual Current Device - type B at the head of your installation. If it is unnecessary, you save costs and work.

You can use the following document for this purpose: 'Earth Fault Protection: How to design efficient earth fault protection with Residual Current Devices (RCD).' See link:

https://www.se.com/be/fr/download/document/CA908066E/

In this document, you will find Selector No. 7 on page 54.

Save this document on your laptop, as well as Selector No. 7 itself.

Fill out Selector No. 7 completely and then review the result. From this, you will be able to determine whether or not you need to provide a type B residual current device at the head.

You can then print this document to PDF, with background selection, and submit it to the inspection body.

Released for: Schneider Electric Belgium