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Ralph Parrett

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Plenum rated cable pulling and installation practices in cold weather

Posted by Ralph Parrett on Jan 8, 2018 2:54:18 PM

‘Tis the Season for the dreaded “Cold Pull”. During the winter months Liberty typically sees claims of cable jackets cracking and splitting from customers. In almost every instance the product exhibits splits and cracks every couple of feet. This is not a defective cable but is an example of incorrect installation procedure by the installer. Plenum compounds are very stiff due to the additions of chemicals to prevent flame spread and smoke generation. Cold temperatures cause this to become very brittle and when the cable is flexed – the jacket shatters and/or cracks as shown below:

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Topics: Technical Bulletin,, plenum, cold, cable cracking, plenum cable, cold weather

Category Cables and their non-Category applications

Posted by Ralph Parrett on Apr 25, 2016 10:00:00 AM

100-Ohm twisted pair cabling has come a long way since the first launch of the 568 standard. Categories 1, 2, 4, and 5 are obsolete. Category 3 hangs on by a ripcord and Category 5e has already lost its market lead to Category 6. Category 6A is moving out of data centers and demand is increasing for even higher performing cables. Category 7 is officially skipped in the US market and Category 8 is in the ratification process.

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Topics: UTP, twisted pair, cat 6, cat 6a, cat 7, cat 8, PoE, cat 5e, HDBaseT, STP, FTP

The case for Category 7

Posted by Ralph Parrett on Oct 29, 2014 8:33:00 PM

First thing, full disclosure and the honest truth – there is no such thing as a “Category 7”. However keep reading!

In the USA, the highest official Category rating is 6A (Category 6 Augmented). Category 6A is a 10 Gigabit Ethernet infrastructure cable officially certified to 500 MHz. It can be shielded or unshielded.

In Europe there are two twisted pair ratings above Category 6A, namely ISO 11801 Class F and Class FA. Class F cable is nicknamed “Category 7” in the US. Class FA has been called Category 7E or Category 7A. The true Category 8 standard is in discussion at this time and has not been ratified. All of these cable are shielded, usually with multiple shields.

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Topics: cutting edge tech,

Plenum rated cables and pulling and installation practices in cold weather

Posted by Ralph Parrett on Oct 29, 2014 6:45:13 PM

‘Tis the Season for the dreaded “Cold Pull”. During the winter months Liberty typically sees claims of cable jackets cracking and splitting from customers. In almost every instance the product exhibits splits and cracks every couple of feet. This is not a defective cable but is an example of incorrect installation procedure by the installer. Plenum compounds are very stiff due to the additions of chemicals to prevent flame spread and smoke generation. Cold temperatures cause this to become very brittle and when the cable is flexed – the jacket shatters and/or cracks as shown below:

Read More

Topics: Technical Bulletin,