While you should always contact the utility company for precise information, you can often get a general idea of a line's voltage by observing its components, particularly the insulators.

• Insulators: The number and type of insulators used to separate the conductors from the poles or towers are key indicators. Higher voltage lines require more insulators to prevent arcing. For example, a single disc insulator may be used for 11 kV lines, whereas lines with 5 or 6 disc insulators are common for 66 kV lines.

• Conductor Configuration: High-voltage lines, especially EHV and UHV lines, often use bundled conductors (multiple conductors per phase) to reduce corona discharge and electrical losses.

• Support Structures: Lower voltage lines are typically carried on smaller wooden or concrete poles. High-voltage and extra-high-voltage lines are usually supported by tall steel lattice towers.