It is an incident command decision whether or not to isolate the utilities in a building. This should be documented in the dynamic and analytical risk assessments, stating what has and has not been isolated. This should be kept as part of the incident risk assessment and decision-making log.
Consider isolating utilities
Control Measure Knowledge
The decision to isolate the utility should be balanced with the need for that utility, which may or may not assist firefighters. For example, isolating the electrical supply that fire-engineered solutions rely on, such as smoke extraction, may be a detrimental rather than a positive action.