They do.
On the 220 kV lines around Auckland they have replaced the hanging insulators on certain pole structures.
Instead of the hanging strings there is a triangular arrangement with resin insulators and increased the clearances from the conductors by several meters.
I will take a photo in my travels and post it in the photo gallery.
This issue is still under investigation but it appears that this container firm has had a line clearance warning before but that didn't cause an incident.
