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| Dear all, Can any one provide me a link for differentiating between Non Plenum, Plenum and Low Smoke Zero Halogen? Basically I would like to know the electrical characteristics and specification between these three. Regards, Joju P Raj
JOJU P RAJ-RCDDjoj.nemo@gmail.com |
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| | As I understand your question, you may be comparing apples and oranges. References to Non Plenum, Plenum and LS0H have to do with product safety. The NEC requires that cables used in premises, both commercial and residential, be "listed for the purpose" by a nationally recognized test laboratory. (i.e UL, ETL) The various levels of fire resistance are hierarchical, meaning that a higher rating may be substituted for a lower rating but not vice versa. The electrical characteristics of Cat 3 (or 5e or 6) are what they are. On the other hand, a Cat 3 CMR, a Cat 5e CMR and a Cat 6 CMR (or CMP or LSZH) must pass the flame and smoke testing of the designation (in this case CMR). A Cat 6 CMR is no safer that a Cat 3 CMR, it just has better electricals. If this is the info that you are looking for, I will be happy to forward you some background info on both topics. Hope this helps... Terri Brown / Superior Essex Tech Support / Telecom Products |
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| TBrown (6/29/2009)
As I understand your question, you may be comparing apples and oranges. References to Non Plenum, Plenum and LS0H have to do with product safety. The NEC requires that cables used in premises, both commercial and residential, be "listed for the purpose" by a nationally recognized test laboratory. (i.e UL, ETL) The various levels of fire resistance are hierarchical, meaning that a higher rating may be substituted for a lower rating but not vice versa. The electrical characteristics of Cat 3 (or 5e or 6) are what they are. On the other hand, a Cat 3 CMR, a Cat 5e CMR and a Cat 6 CMR (or CMP or LSZH) must pass the flame and smoke testing of the designation (in this case CMR). A Cat 6 CMR is no safer that a Cat 3 CMR, it just has better electricals. If this is the info that you are looking for, I will be happy to forward you some background info on both topics. Hope this helps... Terri Brown / Superior Essex Tech Support / Telecom Products Terri, I understand what your post says, and I agree - a Cat 5e is a Cat 5e is a Cat 5e, whether it is CMR, CMP or LSZH. However, aren't there some differences based on the insulation material? The one that popped into my mind is NVP.
Doug Weis, RCDD, ESSdoug.weis@hei-eng.com |
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| | Doug, TIA/EIA 568-B.2-1 defines the minimum Electrical requirements for Cat 6 (example). The minimum Electrical requirements are not adjusted based on where the cable will be used. Even our OSP Cat 6 designs meet the requirements of Cat 6 as defined by TIA/EIA 568-B.2.1. There is some confusion regarding this... I see it occasionally when speaking with customers. There is often a perception that better flame and smoke characteristics equate to better electricals and vice versa. This is simple bottom line explanation... Hope this is helpful! Terri Brown terri.brown@spsx.com |
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| | Doug, You are absolutely correct. The NVP value can be impacted by the raw material and/or pair twist scheme. NVP values published by manufacturers of standards compliant Cat 6 CMP can and do differ. Changes in product designs, raw material formulations, vendor changes or even manufacturing equipment can have an impact. If in doubt, it is always a good idea to verify the NVP number with the manufacturer. In some cases the hard copy catalog may not reflect the latest information. Thanks for your comments, I just hope I answered the original question!  Terri Brown terri.brown@spsx.com |
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