Cord Grip Body

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Crouse Hinds Cable Cord Grip Fitting Body CDB4321A Lot    US $34.99

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Why can't we make the frequency of AC household current higher to prevent muscle tetany?

I don't really understand the physics behind this that well. But in my Anatomy class, the professor mentioned that the reason for muscle tetany was because at 60 cycles/ second (60 Hz), the electric current is in sync with the refractory period and action potential timings of the neurons of the body. This leads to constant pace of sending the same electric singal --> so the person grips the cord tighter. He also mentioned that if the frequency was slightly less or greater this wouldn't be a problem because the timings would no longer be in sync. I understand that we can't make the frequnecy lower, because then we'd constantly see the lights flickering on and off. But then why can't the frequnecy be made higher? Wouldn't this solve the problem? Is it just due to the fact that this would be very costly that this hasn't been implemented?

I'm not sure about your prof's reasoning here. The refractory period for AP firing is about 2 ms and that corresponds to a freq of 500 Hz. Another issue, when you shock the skin, the current spreads out through all of the body. Not all areas will be in synch. In addition to stimulation of muscles via the neuromuscular junction, you will also get direct stimulation of the muscle. Higher frequencies would not avoid any of this. You can also get killed by DC current (zero frequency). Face it, electricity can be dangerous.

Cable machine attachment load centering handle