Understanding J-Hooks in Cable Support Systems

Posted on by FS.COM

J-hooksCable support systems including cable tray, raceway and J-hooks (i.e. J-hook fastens) support cables from the telecommunications room to a work area. Among them, J-hooks are a flexible, efficient and economical solution for support especially when cables are required to install in confined areas that cannot accommodate cable trays or raceways. This post is about the basic knowledge of J-hook since a good understanding of J-hook may help users make the best use of it and get a reliable cabling.

J-Hooks Overview

J-hook, as its name suggested, looks like the letter “J”. It is usually made of galvanized steel or sometimes of plastic polymers, allowing for both indoor and outdoor installation. J-hooks are widely used for cable support because they are easy to reconfigure, offering flexibility, speed and economy in installation. They feature a wide base with smooth, rounded corners to eliminate the potential for snags during installation, while preventing the development of stress points where the cable bundle is supported. In addition, they can maintain the correct cable bend radius which make them less likely to pinch, ensuring the integrity of the cabling systems.

J-Hooks Supported Cable Media & Fill Capacity

J-Hooks offer an easy-to-install, non-continuous cable support for all types of telecommunication, data and power cabling, such as Category cables (e.g. cat3/cat5e/cat6/cat6a), optical fiber cables and coax cables. In addition, there are some J-hook designed for low voltage and fire protection cabling, meeting the related standard requirement.

Application Field Cable Media Tyeps
Telecommunications Category cables (e.g. Cat3/Cay5/Cat5e/Cat6/Cat6a)
Non-Category cables (security, audio/visual)
Optical fiber cables
Coax cables
Low voltage cabling Armored cable
Metal-clad cable
Non-metallic sheathed cable
Power and control tray cable
Modular metallic and non-metallic cable systems (pre-fabricated wire harness)
Duct system Innerduct
Tubing
Conduit

 

In order to ensure the performance of cables, numbers of cables should be within the J-hook cable fill capacity. This means that the numbers of cables should not exceed the recommended maximum cable fill when using with J-hooks. The table below shows us the normal cable fill capacity:

Number of Cables at a 70% Fill Rate
J-Hook
Dia (mm)
J-Hook
Dia (in)
Cross-Sectional Area
(in2)
Cat.5e
4-pair UTP
Cat.6
4-pair UTP
Cat.6a
4-pair UTP
Optical Fiber
4-fiber
75Ω Coax
RG59
75Ω Coax
RG6 Quad
25 1 1.07 20 15 10 20 30 13
50 2 3.97 90 60 35 90 100 50
75 3 9.26 200 150 80 200 250 120
100 4 15.48 330 220 140 330 425 200

 

Fittings for J-Hooks Attachment

In practical applications, an alone J-hook is uncommon to use. Usually, there are some fittings designed for use to make the J-hooks attach to beams, columns, walls, or the structural ceiling. For instance, several fittings options are available for wall mount J-hook attachment. As shown in the following picture, from left to right, they are angle bracket, beam clamp, hammer-on and wire/rod clip.

fitting for J-hooks attachment

J-Hooks Installation

J-hooks are easy-to-install. With proper attachment fittings, users can greatly reduce installation time for J-Hooks. According to some research, the use of J-hooks can yield labor savings of up to 75%. Thus, J-hooks are considered as a preferred alternative to cable tray in some cases. The general installation procedure of J-hooks is as following steps:

  • 1. Attach the appropriate J-hook to the supporting structure. The fastening intervals of J-hook is about 1.2~1.5 m.
  • 2. Lay the cable in the J-hook. It is a good practice to keep the sag at a maximum of 300 mm.
  • 3. A closure tie prevents cables from slipping. If the J-hook can accommodate a cable tie, use the pre-punched holes in the J-hook fastener to install the tie. But make sure that the cable tie does not put pressure on the cables because this can cause distortion of the cable geometry.
  • 4. Check your installation and ensure that the overall appearance of installed cable should be neat.

J-hooks attachment interval

Note: Other factors such as pulling tension, bend radius and cable weight, etc. should be considered according to the practical applications. In addition, users can choose custom J-hook trees for multi-media cabling systems.

Conclusion

J-hooks are one of the most cost-effective solution for supporting horizontal cabling, providing a broad base for cable support, reducing stress and bending. This post introduced the basic knowledge of J-hooks, which help users better understand them. Meanwhile, you can buy the most cost-effective J-hook products via FS.COM. We offer wall mount J-hooks and various options of fittings for attachment. Diameter including 3/4 inch, 1-5/16 inch, 2 inch, 4 inch and so on. Welcome to contact us over sales@fs.com for more details.

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