Primary and Secondary Lines

Primary lines, or primaries, are higher-voltage lines located at the top of utility poles, above transformers. Primaries are usually made out of copper or steel encased in highly conductive aluminum. Typical primary voltages 2.4/4.16kV to 19.9/34.5kV.

Secondary lines, or secondaries, are located lower down on utility poles, usually below transformers. Typical secondary voltages are between 120/240 1ph and 832/480 3ph. Although the voltage is lower, these lines can still deliver a severe electrical shock if contacted.