My Check Box replaces the need for annual calibration
Check Boxes were more commonly introduced 2005 when Part-P was launched. The periodic meter checking process was introduced as an additional check to coincide with your annual calibration. We frequently come across electricians that have been miss fed this information by their local inspector, they may well be happy for you not to regularly calibrate your meter, but what does your liability insurance say? The guide line for all monitoring bodies is quoted to be ‘As per the manufacturer’s recommendation’ which is every year.