Occupational. Plumbers, pipefitters, and steamfitters install and repair pipes that carry liquids or gases to, from, and within businesses, homes, and factories. Connecting new boiler to the mains electricity. Is it necessary to connect a new boiler to a fused spur? It strikes me it would be a lot easier and Larimore no spark required to simply plug it in Rowe to a... Outside socket on a spur Electricians Forum Talk. Discuss Outside socket on a spur in the Electrical Wiring, Theories and Regulations area at .