Curiosity question:
Helping an automation peer with the installation (or not) of a similiar Eaton #160 TVSS as I documented in this thread.
We did a skype video call yesterday and I looked at his panel via the video.
It came with the 18" pigtails.
The top of the fuse panel has free breaker spots. (well 3 - 2 on one side and 1 on the other side). The fuse panel is between two 2X4's (flush).
The neutral bus bar is on the bottom of the fuse panel. The ingress of power is also on the bottom of the panel. (main 2 phases of electrical feed). (mine is on the top of the panel).
This is what has been looked at for installation. It appears that it can only be installed on the top or the bottom of the fuse panel.
1 - Installation of the PTX160 on the top of the fuse panel. The issue here is that the neutral pigtail is 18" long and will not extend to the neutral bus bar on the bottom of the fuse panel. I do not think you can extend the neutral pigtail at all (not sure though).
2 - Installation of the PTX160 on the bottom of the fuse panel. Here the pigtails will be fine but all of the fuses will need to be moved up a notch.
3 - abandon efforts for installation of the PTX160 and get a smaller TVSS.
Top installation example drawing - which will not work because neutral bar is on the bottom of fuse panel unless neutral can be extended.