MAS electricians provides comprehensive electrical installations, maintenance and testing for the home. Our City & Guilds qualified electricians know exactly how to cater to a range of electrical requirements - small or large. We offer comprehensive electrical installations and maintenance for the home. Here is a summary of some of our most popular domestic electrical services. We offer comprehensive electrical installations and maintenance for the home. Here is a summary of some of our most popular domestic electrical services. Expert installations of RCD boards - an upgraded fuse board - with advanced overcurr- ent protection.