I want to set up an electronic work area. I'm worried about ESD etc. I'm confused why some aspects of ESD precautions require high resistance to ground (1 Megohm for wrist straps) and others need to be low (milliohms marketed for the soldering iron).
I know the wristband should have higher impedance to reduce the chance of electric shock, but I don't see why such a low resistance is desirable for the soldering iron, if the goal is an equipotential. Yes, when charge is suddenly introduced that needs to be dissipated to ground, a higher resistance means a higher voltage. But since static is likely to be generated by a person, and the wrist strap needs such a high resistance, then the resistance of the soldering iron is immaterial if it is already many magnitudes smaller.
The only reason I can surmise is the iron's earth is less for ESD and more just electrical safety, eg if there's a live fault, so current will surge to earth and fuse will quickly blow. This has then been mis-marketed as an ESD feature.
End then there are ESD mats, where the top layer is "dissipative", i.e. not an insulator but pretty dawned close, (gigohms?), magnitudes greater than the wristband. Why?
What's the reason for differences?