Ice on Power Lines

"Ice on power lines" refers to a layer of frozen precipitation accumulating on electrical power lines, which can add significant weight, causing them to sag, break, or even snap, leading to power outages, especially if combined with strong winds; even a small amount of ice can be problematic and can cause damage to the lines and surrounding infrastructure.

Key points about ice on power lines:

1. Weight issue:
The primary concern is the added weight of ice, which can significantly strain the power lines and supporting structures, even a small amount of ice (around 1/4 inch) can cause issues. Half an inch of ice can add as much as 500 pounds to a power line, and damage can begin when accumulations exceed a quarter of an inch. Additional weight can be applied if a tree branch breaks off and rests on it, increasing the potential for the power line to come down.

2. Melting ice:
Melting ice can also cause power outages. If ice on the bottom (neutral) line melts before the lines above, it can cause the lines to touch.

3. Impact on trees:
Ice accumulation on tree branches can cause them to break and fall onto power lines, further disrupting electricity supply.

4. Galloping lines:
Strong winds can cause ice-covered power lines to "gallop" which can result in further damage and power disruptions.

What to do during an ice storm with power lines:
▪️Stay indoors: Avoid going outside unless absolutely necessary. Do not stand under, or near, power lines that have accumulated ice.
▪️Report downed lines: If you see a downed power line, stay far away and report it immediately. ALWAYS assume that downed power lines are energized and dangerous.
▪️Be aware of falling debris: Watch out for falling tree branches that may be weighed down by ice.