I’ve recently installed a hardwired video doorbell and a wireless chime. It replaces an old style doorbell and chime which I removed entirely - leaving just the wiring to the doorbell and from the transformer. I just wago’d those wires together in their own exclosure just inside the front door. The transformer is a Honeywell 8V ac 1A and is located next to the consumer unit in the downstairs loo. Everything’s working fine. However, because I wired directly to the transformer I didn’t use the bypass “cable” supplied in Bag C. Clearly, this cable isn’t just a piece of wire - it’s a component of some sort (resistor, dioide, fuse?) in a piece of heathshrink. As I say, everything’s working fine without it and the transformer only gets slightly warm. Can someone advise whether I really should use the bypass cable and hence the included component? And suggest what it might be? FYI, I’m in the UK.