W.W. Cross said:
Marc:
This question has been coming up a lot lately, and we have to be careful how we answer it due to the diversity in code interpretation across the country. UL tested our products for one cable, which is pretty much standard. We are aware however that many contractors run two, 12 or 14 cables under a #100 staple with no problem. The LL# 100 and the LL141 can physically hold even 3 and 4 cables securely, however some inspectors will only allow one cable regardless of leg length and holding capacity. That is why we have to be careful in advertising multi-cable capability.
You are correct that leg length is an important factor in holding capability, but leg design and shape is also important. You will notice that the Viking #100, #125, etc. legs are not round. They are flattened which increases holding ability. A Viking staple will therefore hold better than most round-leg staples.
The solution will probably be for us to request UL or other lab testing for multiple cables, which is expensive and time consuming. In the mean time, we suggest the inspectors be realistic about a staple’s intended purpose “to adequately secure a cable or cables without damaging them”. A simple pull test would seem to be adequate to address this issue. Pull on it and see if it comes out. If it does, you need a bigger staple. If, not, go with it.
If the Inspectors are concerned about “over driving” in order to make the staple hold on multiple cables, one of our insulated staples such as the IN 3000 or IN3125 may be the answer. We have seen sales of IN3125 (based on our #125 staple) increase lately, primarily for this reason.
Finally, Viking is introducing a line of plastic “stacking staples” this fall. These will be designed to hold 1-2 or 3 cables and will be color coded for 10, 12 and 14 cable. They will be more expensive than steel staples but they should address this issue in problem areas.
Hope this helps, we will be happy to supply samples or additional information at your request
Tom Trudeau
President
