Low Smoke Zero Halogen - General Information
Why Low Smoke Zero Halogen?
Standard power cable jackets are made from a PVC compound containing Chlorine (part of the Halogen Group), which, when burned release a toxic gas that can cause serious damage to humans and electrical equipment. This raises concerns in applications that have dense PVC cabling where electrical equipment or people are present. Low Smoke Zero Halogen, also known as Low Smoke Free of Halogen or (LSZH, LSOH, LS0H, OHLS) refers to the cable jacketing which is composed of thermoplastics/thermoset compounds that release limited smoke and no halogens when exposed to high heat/fire. This cordage was initially invented to solve two main problems: reduce smoke/improve visibility in an emergency fire escape situation and reduce toxins being released in such a fire that could harm victims exposed. This cordage is generally used where there is limited ventilation or where set standards require such health/safety measures. You can find the amount of halogen contained in typical LSZH Cable in Table 2 below.
Common Abbreviations and Terms for Low Smoke Zero Halogen
|LSZH||Low Smoke Zero Halogen|
|LS0H||Low Smoke Zero Halogen|
|LSHF||Low Smoke Halogen Free|
|LSNH||Low Smoke No Halogen|
|NHFR||NonHalogen Flame Retardant|
|HFFR||Halogen Free Flame Retardant|
|FRNC||Fire Retardant, Non-Corrosive|
|FRLS||Fire Resistant, Low Smoke|
Table 1: Low Smoke Zero Halogen Terms and Abbreviations
Halogen Content in Standard Wire & Cable Polymers
Using the table below, you can see that standard PVC cables contain vastly greater amounts halogen contents that any of the LSZH polymers.
|Polymer||Halogen Content % by Weight|
|EPR (Ethylene propylene rubber)||<.02|
|XLP (Cross-Linked Polyethylene)||<.02|
|CSPE (chlorosulfonated polyethylene)||13-26|
|CPE (chlorinated polyethylene)||14-28|
|PVC (polyvinyl chloride)||22-29|
|FEP (fluorinated ethylene propylene)||62-78|
Table 2: Halogen Content in Typical Wire & Cable Polymers
When should I use LSZH cabling?
Low Smoke Zero Halogen cabling is usually used in regulated industries such as government. New data centers are sometimes choosing to use LSZH cabling to help protect data center facilities from the harmful smoke in case of fire. Because data centers utilize large ventilation systems, even a small amount of smoke in a small area can quickly be distributed accidentally throughout the entire building through the ventilation systems. A side note is the National Electrical Code requires cables used in plenum spaces to be Low Smoke Emitting, which is another common usage of this cordage. Refer to the National Electrical Code(NEC), or the National Fire Protection Agency(NFPA) to determine if LSZH cordage is right for you.
IEC 60320 C13 CONNECTOR (FEMALE)
- The IEC 60320 C13 is a grounded 3 Wire connector rated up to 250V and 15 Amps. The C13 mates with a C14 inlet, and is commonly used in a jumper cable scenario in IT Installations providing power from a PDU to a server, router, switch or other computing device. Most people know the C13 as 'the thing that plugs into my computer' because it is the standard connector used to power most desktop computers. In a desktop computer application, the most common cable is the NEMA 5-15P to C13, which connects your standard North American wall outlet to a desktop computer.
IEC 60320 C14 CONNECTOR (MALE)
- The IEC 60320 C14 is a grounded 3 Wire Plug rated up to 250V and 15 Amps. The C14 mates with a C13 outlet, typically found on Data Center/IT specific PDUs (Power Distribution Unit). The IEC 60320 C14 is typically used with either 18awg SVT, 18awg SJT(OW), 16awg SJT(OW) or 14awg SJT(OW). The types of cordages used will change the rating of the overall cord set.
IEC 60320 C15 CONNECTOR (FEMALE)
The IEC 60320 C15 is a grounded 3 Wire connector rated up to 250V & 10 Amps Internationally and 125V/250V & 15 Amps in North America. The C15 mates with a C16 inlet as well as a C14 Inlet and is commonly used in IT Installations providing power from a PDU to a server, router, switch or other computing device. The C15 is a HIGH TEMPERATURE connector rated up to 120°C, unlike the 70°C rating of the C13. The C15 is commonly used in in electric kettles and other household appliances that involve higher temperatures than a normal C13 is made to withstand. The C15 connector is commonly used with 18awg SJT(OW), 16awg SJT(OW), and 14awg SJT(OW).
IEC 60320 C19 CONNECTOR (FEMALE)
- The IEC 60320 C19 is a grounded 3 Wire connector rated up to 250V and 20 Amps. The C19 mates with a C20 inlet, and is commonly used in a jumper cable scenario in IT Installations providing power from a PDU to a server, router, switch or other computing device. The C19 is typically used in high powered blade server chassis, large network routers, and other IT equipment that draws more power than a standard C13 can accommodate.
IEC 60320 C20 CONNECTOR (MALE)
- The IEC 60320 C20 is a grounded 3 Wire Plug rated up to 250V and 20 Amps. The C20 mates with a C19 outlet, typically found on Data Center/IT specific PDUs (Power Distribution Unit). The most common configuration for a C20 is in a jumper cable scenario, providing power from a PDU to a blade server chassis, high powered server, large network router, or similar device.
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