Yes, it is safe. The only possibility of personal injury is a finger cut from the snipers. As Jim Grupé has already said, it's possible that cutting the cable could damage the router or PC Ethernet adapter, but this is highly unlikely.
Do Ethernet couplers reduce speed?
No, Ethernet couplers does not reduce speed. Once a connection is established, speed remains the same. Problems result in packet loss, so throughput might be reduced due to resending, but speed remains the same.
How do I connect two Ethernet cables to one port?
In one room there may be only one port available, and the plug from the splitter is plugged into the port to provide two ports for two devices. At the patch panel, the second splitter is plugged into the appropriate port in the panel and two Ethernet cables connect to two router or switch ports.
Does Ethernet connector affect speed?
Does ethernet cable length affect internet speed? The answer is no. In most cases you will not experience any loss in speed or reliability based upon the length of ethernet cable you get.
Is it OK to use Ethernet coupler?
Yes they can. There are two ways. If the cables are already terminated, then a RJ45 coupler can be used, joined together the two cables. It will introduce a slight discontinuity in the wiring, and there will be small reflections of the signals.
Does splitting an Ethernet connection slow it down?
To answer, no, the splitters will not slow down the connection if they are utilized in a 100Mbps network. However, if your router can deliver 1Gbps and you put a splitter in the middle, the bandwidth will be limited to 100Mbps. The splitters did restrict the speed in this case, and the connection will be slower.