Electrical panel boards are used to locate controlling, measuring and metering devices which are used in electrical power distribution. It is a customized product which is used for a specific purpose. The proper functioning of an electrical panel board can be ensured by properly maintaining it. Normally, it will be routine maintenance which will be performed once a year or half a year. But it is essential to know the service condition of an electrical panel board to avoid failures and perform the maintenance activity where it is necessary. This book presents a method to assess the service condition of an electrical panel board which is very useful in implementing of predictive maintenance activities in an electrical installation.