Northern Power – upgrades to existing premises Max. 80A single phase for EV chargers and Heat Pump installations.
Alot get confused when they see 100A on the carrier however, this only refers to the max Amp’s the carrier is rated to and has no baring on the actual fuse fitted. DNO’s use to at one point, fit a sticker over the carrier stating the fuse size but, they don’t any more. Think of it as a 13A plug, which refers to the max amp it will carry but, could be fitted with 5A fuse!
In most cases, unless pressented with older or damaged cut-outs,Charge point and Heat Pump installers should always assume that the cut-out fuse size is 60A regardless of what the carrier states. If the surveyers calculations confirms that the installation total load will not exceed 60A at any time then there is no need for a DNO assessment to uprate the cut-out and the EV charger/Heat Pump install can proceed and notification sent to the DNO of installation. Thats the correct way but, in many cases with national installation companies, the home owner essentially does their own survey. The contractor wwo does the install,often downrate the charger power when there’s no need to.