In the case of explosion hazard, if there are less than four bolts between all adjacent metal equipment and facilities and between adjacent flanges in a non-corrosive environment, and the resistance is greater than the sixth power Ω of 10, copper sheet or copper wire should be used for equipotential connection, that is, jumper.
Extended data:
Two common bridging methods:
1, intermediate jumper method
Intermediate jumper method uses unused idle pairs in Ethernet cables to transmit DC power, which is applied between ordinary switches and network terminal equipment.
The intermediate jumper mode can supply power to the network terminal equipment through the network cable. Mid-span PSE is a special kind of power management equipment, which is usually placed with switches. It has two RJ45 jacks corresponding to each port, one is connected to the switch with a short wire, and the other is connected to a remote device. ?
2. Terminal jumper method
Terminal jumper method is to transmit direct current on the core wire used for data transmission at the same time, and its transmission frequency is different from Ethernet data signal. The corresponding endpoint PSE (terminal power supply equipment) has an Ethernet switch, router, hub or other network switching equipment supporting POE function.
It can be predicted that the end span will be popularized rapidly, because Ethernet data and power transmission use public wire pairs, so there is no need to set up special wires for independent power transmission, which is especially obvious for cables with only 8 cores and standard RJ-45 sockets.
References:
Baidu encyclopedia-jumper