The phone rang at 7pm on a Monday. We need to mobilize now! Three floors of the hospital’s network were down. I didn’t know at the time but a 12 strand pre-existing single mode fiber optic cable had been destroyed by the h07rn f cable pulling crew. This team had been installing a new 12 strand armored fiber. One of the guys in the middle of the run didn’t have a ladder. The guy appeared to be tugging the armored cable from the floor. There was a bundle of about 20 armored fiber cables coming from a hole in the wall above the ceiling. The new fiber being pulled turned out to be resting over the bigger bundle of fiber. As he was tugging from his location on the floor he was pulling the new cable down on the active bundle. He was in fact burning up the outer coats on the existing cables. All of the cables could possibly have made it except for the one in the center of the bundle that was not armored. The new armored cable burnt through it very easily.
This situation disrupted 3 floors of one area within a NYC Hospital. We were summoned for emergency mending. We were able to patch it up quickly that night. A couple of days afterwards we conducted a permanent solution. When we started troubleshooting we had no idea where the issue was. We just knew there was a group installing twin and earth cable in the data center the night before. We shot a laser beam light over the fiber from one of the fiber heads within the data center. Once we looked around we saw some light inside the ceiling. As we checked nearer the opening through the wall where the larger bunch of fiber had been coming through was basically illuminated red like a X-mas tree. We had singled out the problem to this place. We were able to pull back a certain amount of slack and when we pulled it out from the wall the laser was beaming out from the cut fiber!
The moral from this experience is use suitable equipment in addition to common sense please! Basic laws of physics will confirm, you should not tug down on a cable that’s rubbing against another cable or maybe a bunch of cables for an extended time period with out catastrophe. This was expensive to fix and created an embarrassing situation for the contractor. Think before you pull!
For both electrical and fiber optic cables, tools are needed to strip the insulation jacket from the 2/0 welding cable. This tool is called a cable slitter. For armored fiber optic cable, a more specialized tool called armored cable slitter is designed for the same purpose.
If you’ve ever tried to slit electrical or fiber optic cable very far without ruining the inner wires and fibers, you know how hard it can be. This little tool does a amazingly good job in two seconds. The same process can take you up to 5~10 minutes if you are using a standard knife or wire cutter.
A cable slitter that slits cable insulation without nicking the wires or fibers is a useful tool for new work or adding extra outlets.
Using a cable slitter avoids the chance of cutting through the insulation of the underlying individual conductors or fibers. This tool allows you to safely slit, split and remove insulation up to 4.8mm thick from many kinds of single or multiple conductor cable.
The rotating blade allows you to slit your welding cable price list in both a longitudinal as well as orbital configuration. It can slit jacket material of PVC, Teflon and THHN.
In the tool, a precision swivel blade lets you make a full 360° slit around the cable. If you want to slit the cable lengthwise, just rotate the slide lever to swivel the blade 90°.
The slitter’s blade is replaceable, you can just slide roll pin in the handle to one side to remove the spare.
But even among electricians who strip cable for a living, this tool is surprisingly lesser-known.