This may be obvious, but for others reading who don't have their charger yet: When ours was installed it had a sense wire separate and parallel to the main current carrying cable. The sensor measures the total house consumption allowing the charge point to throttle back if the total consumption reaches the limit. The limit in our case is set, using the charger app, to 60A to match our main fuse. It's most unlikely to have to operate because we'd have to be unlucky to operate all the high current stuff at once (I charge at night) but it's reassuring to know I'm never going to blow the main fuse. I did not know about this feature ( which probably has an official name) when I ordered the charger. I lucked out and would have been happier if I'd known beforehand. Hence this post