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* Category I: used where equipment is not directly connected to the mains.
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Category and I
Category and used
An 8P8C | 8P8C modular connector ( Registered jack naming confusion | often called RJ45 ) commonly used on Category 5 cable | cat 5 cable s in Ethernet networks
* Category 1: Military firearms ; According to French law, a military firearm is a weapon which has a gauge used by the army since 1880.
* Category 4: Civil firearms ; According to French law, a civil firearm is a semi automatic long gun with more of 2 rounds in magazine which don't use a military gauge, or a handgun ( pistol or revolver, including all magazine capacities ) which doesn't have a gauge used by the army.
This use of the ACAT acronym is reminiscent of another ACAT ( for Acquisition Category ) used in US Defense industry procurements, in which Risk Management figures prominently in decision making and planning.
Instead of following the Fast Ethernet standard for twisted pair cabling by using only 2 pairs of wires, 100VG-AnyLAN used all four pairs in either Category 3 or Category 5 twisted pair cable.
* Category III: used on permanently installed loads such as distribution panels, motors, and 3 phase appliance outlets.
* Category IV: used on locations where fault current levels can be very high, such as supply service entrances, main panels, supply meters and primary over-voltage protection equipment.
For example, baluns can be used to send line level audio or E-carrier level 1 signals over coaxial cable ( which is unbalanced ) through of Category 5 cable by using a pair of baluns at each end of the CAT5 run.
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