How do I connect a signal shield to minimise noise from close proximity AC
Is there an equivalent to this cable where the data member is a "star quad" cable? A differential signalling standard on correctly wired "star quad" cable is more resistant to interference. 

Star quad cable has 4 conductors in a circle (I numbered them clockwise below)
1 2
4 3
Use 1 and 3 in parallel for one leg, and 2 and 4 for the other. This gives much better noise cancellation than a regular twisted pair.

The downside of star quad is a much higher capacitance between legs, but over short (1m) runs that won't be such a problem.

edit : this tight twist is what I think of as star quad; though ordinary quad used the same way will also provide reasonably good immunity to interference. Image from the Canford catalogue.