An improved service entrance head including (a) a head or cap, (b) cap support or collar, (c) segmented conduit mounting and (d) an insulating service wire support or wire separator, that allows for replacement of an installed service entrance head with the service passing through the collar and separator without requiring that the service be severed. Both the collar and the wire separator may be segmented so that they can be removed from a position surrounding the service and replaced. Methods are disclosed.