Testing existing installation, notice one circuit that supplies 10 * 30 watt LED lights has a 16 amp mcb protecting it. Change the mcb to 6 amp and it instantly trips, thought maybe I'm missing more light fitting on circuit. Used my clip on ammeter and it reads 1.7 amps, all dead tests and live tests are fine. Then thought maybe a high inrush of current, changed mcb to type c and it still trips but change it back to the 16 amp mcb and it works fine. Am I missing some thing here.