<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Capitals, sans-serif; "><div><div><div>Wrenches,</div></div></div><div>I searched the archives, but came up with nothing on this….</div><div><br></div><div>I have found a good supplier for reasonably priced stainless steel cable ties and have been using them in place of black nylon cable ties for supporting cables, PV wires and micro-inverter wires to the mounting rails and such. I feel better knowing the wires under the array are supported this way rather than with plastic/nylon cable ties, for which I tried but cannot get a manufacturer to guarantee will last 20+yrs.</div><div><br></div><div>A colleague is questioning this method (SS ties) with the concern that over time the (albeit small) movement in the wires and/or expansion/contraction of the rails could result in the stainless steel cable ties cutting thru the wire's insulation and then…..</div><div>I have heard this concern before from others as well.</div><div><br></div><div>The way I see it is that the very popular stainless steel "S" cable clips that hold wires to module frames have comparable equal sharp edges as well and would pose the same risk, but there doesn't seem to be any concern there.</div><div><br></div><div><div>I am wondering who else is using SS ties in place of nylon ones, and if you are taking additional steps to protect the wire's insulation from the SS ties?</div></div><div>Common sense abides, meaning don't wrap a wire around the SS ties so that the wire has tension on the sharp edge of the tie. Flat edge contact with the wire only, the same way that you wouldn't run a wire across/around a sharp cut edge of a rail or anything else.</div><div><br></div><div>Thanks,</div><div>benn</div></body></html>