It is a device that is used to ground vibrating machinery to the ground wire of the device's feeder wire. The strap has extra flexibility that will take the bending and flexing from the machine to the ground terminal. If a wire is used, most times it will stress fracture and break due to the vibration, leaving the device ungrounded.
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The yoke or strap is the metal fram that hold everything together and where the outlet attaches to the box.
This answer is taken from the CEC. Table 17 states minimum size of grounding conductors. For a service conductor drawing 400 amps a #3 copper grounding conductor is needed. Also see rules 10-206, 10-700 and 10-812 if you have access to the code book.
I would suggest not wearing one, because the CRT uses very high voltages which could potentially remain while you are servicing it. Grounding yourself will put you at a greater risk of serious shock. The parts in a CRT are generally not as likely to be static sensitive as many other electronic devices, so the need for a grounding strap is not as great. Also, before working with a CRT, do some research into other precautions you should take to avoid electric shock.
In Canada the grounding electrode requirement is for two steel 5/8" x 10' copper clad rods spaced 10 feet apart.
A; By wearing a wrist strap connected to chassis and grounding the chassis to earth ground