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There are some OSHA requirements for a 2nd person but only for certian jobs >600V.

However, there is a requirement that applies here for the CPR qualified person. Some larger industrial facilities will have a 1st response team that is supposed to be able to get anywhere in the plant in 4 minutes but with roof top substations sometimes that is not possible.

1910.269 (b)(1)"Cardiopulmonary resuscitation and first aid training." When employees areperforming work on or associated with exposed lines or equipment energized at 50volts or more, persons trained in first aid including cardiopulmonary resuscitation(CPR) shall be available as follows:

(b)(1)(i) For field work involving two or more employees at a work location, at least twotrained persons shall be available. However, only one trained person need beavailable if all new employees are trained in first aid, including CPR, within 3months of their hiring dates.

(b)(1)(ii) For fixed work locations such as generating stations, the number of trained persons available shall be sufficient to ensure that each employee exposed toelectric shock can be reached within 4 minutes by a trained person. However, where the existing number of employees is insufficient to meet this requirement(at a remote substation, for example), all employees at the work location shall betrained.