Balanced wiring is sometimes called XLR wiring because it often uses that kind of three-pin connector. But it's dangerous to assume that an XLR plug or jack is balanced. Although most manufacturers reserve these connectors for balanced circuits, there are exceptions. Check the equipment specs. You can also get into trouble assuming that other kinds of connectors aren't balanced.
Some manufacturers save money and space by putting balanced signals on three-conductor phone jacks.
From the front panel, these look identical to two-conductor unbalanced jacks. Again, check the specs. And a balanced connection works only if both ends are balanced. If either of the two internal wires are shorted to ground at either end, the whole thing becomes unbalanced. So don't do these things.