100 VA current limiting for fiber-in-the-loop and wireless communications power networks

The author describes 100 VA current limiting on power feeds. This single power feed, limited to a 100 VA by National Electric Code standards, can determine the structure of an entire power system. The problems and solutions for 100 VA current limiting are discussed, with the scope limited to fiber-in-the-loop and wireless communications networks. A ceramic positive temperature coefficient resistor (PTCR), essentially a doped barium titanate resistor, appears to be a unique and economical solution to limiting individual feeds from a central power supply when employed in a thermal breaker