Can wires related to modems and internet emit harmful radiation? I am installing internet services at my house and need to run wires (Ethernet, modem, router related) along the lower part of the wall near some beds.  Can people sleeping in the beds be exposed to harmful radiation (cancer-causing) from these wires?
Edit: my concern lies primarily with all the different sorts of wires involved.  But I'd be curious about the router and modem too
 A: No more than your power wires to your AC outlets. It takes radiation energetic enough to be ionizing to do that (UV wavelengths or shorter like x-rays or gamma rays).
In case you didn't know, shorter wavelengths are more energetic. Visible wavelengths are much shorter than those radio waves radiated by WiFi or ethernet wires, but only a bit longer than those in UV. I assume you don't worry about visible light causing cancer.
And sitting between visible light and radio waves is radiated heat (long infrared). I also assume you aren't worried about heat from objects, even glowing red hot ones like an oven or heating lamp causing cancer.

https://en.wikipedia.org/wiki/Electromagnetic_spectrum
A: People have had internet wires in their houses for 20+ years, and while not all cables run close to beds, certainly some do so -  given the omnipresence of this kind of wires - if there were harmful effects, we’d know by now.  Never mind bedrooms think of offices, where people would also be exposed for  long periods.
So we can say with almost certainly that it’s highly unlikely that this kind of wiring has adverse health effects over periods in the 20+ year range.  Moreover, technology is improving, so we can also say that those who have been exposed in the early 2000s were probably more exposed than people nowadays so the exposure risk is likely decreasing in time on a per-device basis.  It could be that overall exposure has increased as the prevalence of the modems and routers has increased, but again: it’s not like there’s a detectable increase in cancer, at least not an increase attributable internet cables or gear.
This isn’t like cigarettes, for instance, where the adverse effects where known on animals, and where the prevalence of lung cancer was easily detectable as function of the age and as a function of nicotine consumption of individuals.
There is current no evidence to suggest that wifi radiation, or anything related to the wiring of internet gear, had adverse health effects.
