North American Clean Energy, Jul/Aug 2014, by Tom Hood & Sicco W.T. Westra.
http://www.nacleanenergy.com/articles/18223/reducing-costs-of-residential-solar-pv-through-module-hardware-innovations

"To make life easier for solar system owners, several companies are working to lower BoS [Balance-of-System] costs and simplify racking designs and installation efficiencies. For instance, cost-competitive, roof-mounting brackets are one option now available to installers that can accommodate different types of rail supports for solar modules. Support rails with built-in wire clips are another example of a simplified BoS design, which lowers the cost of hardware and installation by five to ten percent."