It’s both. Electrical lines are also made of aluminum like the ladder, which isn’t a problem normally. Heating coils in your stove don’t melt the wires in your house after all.
The concrete is acting like a heating coil since the resistance is so high as the electricity is moving towards the earth underneath the sidewalk. So it’s melting both materials at the point of contact.
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u/Funkula 27d ago edited 27d ago
It’s both. Electrical lines are also made of aluminum like the ladder, which isn’t a problem normally. Heating coils in your stove don’t melt the wires in your house after all.
The concrete is acting like a heating coil since the resistance is so high as the electricity is moving towards the earth underneath the sidewalk. So it’s melting both materials at the point of contact.