Today switchboards from 50kVA to 3500kVA are manufactured for electricity distributors and mining companies alike and from form 1 construction to form 4a arc contained design to AS3439.1 annexure ZD. While switchboards for new installations are most common, with the aging network that exists in Australia the necessity to retrofit assemblies is regularly required. In some cases the demand exists due to equipment failure but in other cases it is a matter of improving the safety of the installed equipment.