This mod breaks signal wires in blueprints.

Steps to reproduce:
1. Make a blueprint of two Big electric poles that have red and/or green signal wire between them.
2. Place the blueprint.
3. Let your bots build the poles as specified.
4. See that the poles are connected by power and signal wires.
5. Place the blueprint again in such a location as to extend the power grid, either overlapping or within range of one of the poles you just built.
6. Let your bots build the pole(s) as specified.
7. See that the connection between the new and existing poles is only a power wire - there are no signal wires.
8. Place a signaling device, such as a constant combinator, set a signal, and attach it to one of the poles.
9. See that the signal does not go across the connection mentioned in step #7, thus showing that this is a functional issue, not a cosmetic one.

Let me know if you have any questions.

From what I understand, once the big power poles are placed they are converted to surveillance cameras. When you place a blueprint ontop ( it will say that the camera is in the way). Signal wires wont auto connect due to the pole being "renamed". One temp work around is to disable the surveillance centre while building new lines with circuit lines. Then to re-enable it once the expansion is completed.