Archives for September 2016

What is minimum bend radius?

Minimum bend radius is the smallest allowed radius the cable is allowed to be bent around. While cabling, these cables are bent in many different directions when going through conduits and when pulling around a sheave.

Cables are composed of different components and if bent too far you may put too much stress on those components to the point of damaging them. For example, a 6 strand indoor fiber optic cable if pulled too hard around a tight 90 may appear to be fine once the cable pull is finished. Unfortunately, what commonly happens is the stress around that 90 caused the individual strands to break under the jacket. To prevent this kind of damage, cable standards such as The National Electric Code (NEC) and the Insulated Cable Engineers Association (ICEA) formed requirements for minimum bend radius.

How to Calculate Minimum Bend Radius.

 

bend-example

The figure above  shows a cable with an outer diameter of 2 inches being bent around a radius of 12 inches. The minimum bend radius is based on the diameter of the cable and the type of cable. The following formula is used.

Minimum Bend Radius = Cable Outer Diameter x Cable Multiplier

Cable multipliers are determined by industry standards and vary from cable to cable. When purchasing a cable, check the spec sheet, many manufactures have the minimum bend radius provided to you for each cable part number.

 

Need help Fire Stopping high traffic areas?

Before you go purchasing Firestop material make sure you have the correct type for your installation, measure twice cut once. Here’s a great overview video of many different types of products for your particular installation.

Let’s take a look at one of the more popular item in that video, the Composite Sheet.

The Composite Sheet is an excellent choice for medium to large openings through common constructions, cable trays that handle communications and power, multiple metallic conduits, tubing and more. You can also cut and shape it to your desire using common sheet metal tools and when burns it expands up to 15X original size and that’s amazing!

For more information on the Composite Sheet and many other Fire Stopping products visit Discount-Low-Voltage.com

Customer Testimonial on Pre-Terminated Fiber Optic Cable

Pre-terminated fiber optic cable assemblies cut installation time and cost drastically. Many people unfamiliar with fiber optic cable and termination believe it to be very complex, fragile and expensive. Pre-terminated fiber optic cable offers a fast, simple and reliable solution that also installs in half the time of traditional field terminated systems.

Traditional premise fiber optic cables, hardware, fusion splicing and connection in the field have remained more or less the same over time. Trying to hurry the installation process using these old methods carries a risk that quality and reliability can suffer. As a result, the final deployment can be more costly and slower, and can significantly affect the production environment. Generally speaking, it all becomes more complex and costly than is strictly necessary.

Brian Miller from Miller communications has made purchases for this cable from Discount-Low-Voltage.com and he was nice enough to give us a phone interview about his experience after his installation. Let’s see what he had to say from our YouTube channel.

Fiber cable preterminated is available in a single-mode, 50µm, or 62.5 µm, and loose tube outside plant or flame retardant indoor/outdoor cable carrying from six to 144 fibers and just about any other fiber you can think of. This solution will require slightly more time in the design phase spent in determining and measuring appropriate lengths, spacing and technical requirements. Long term expansion and growth can be easily planned during this time. Time spent early in the design phase results in reduced time spent in the field installation phase.

You can order this cable in any length, with any connectors and any fiber type your application calls out for. Order online or call us at 888-797-3697

Special thanks to Brian Miller from Miller communications. If your looking for phone system and communications work in the pacific northwest call him at (503) 397-3801.