Voltage is electrical potential difference, measured in volts. It is distinct from current and resistance, and it does not alone describe an electrical hazard.
What this means at your property
Restoration equipment must be used with appropriate power arrangements, while water-damaged circuits and appliances require their own assessment. A device turning on does not establish that it is suitable for continued use after a loss.
Who should address power concerns before work begins?
Identify the qualified electrician or responsible building contact. Ask the work plan to distinguish temporary equipment power from inspection and repair of affected electrical systems, and follow any restrictions on use.