In this video, we are discussing the requirements and rules for the choice of the RCD Type on the AC side of a PV-Inverter installation. Is there a mandatory Type-B requirement?

This is a topic which is highly complex and very dependent on the individual situation. Let's look into the details.

 

Wave Form RCD Types Explained
Type A – ideal for circuits using AC and DC power.
Type AC – trip on sinusoidal residual current.
Type B – respond to higher frequency current.
Type F – designed to provide protection against residual fault currents comprising composite frequencies.

Category "B" is more current sensitive, which means it's fast
And yes, you need a category "B" RCD

I didn't understand where the type B RCD is to be used, in an AIO Inverter.

Roland talks much about this subject, but I suppose DC leakage could occur from both the AC IN and AC OUT.

So where is it most important? Does it matter if the AIO can backfeed the grid ?

I would appreciate your thoughts.

Edited June 26, 20233 yr by meetyg