They are not at all safe and are junk that needs to be recycled and never installed even in a barn let alone a home. Zinsco company went out of business partly because it was discovered that their breakers did not trip when they were supposed to. For this reason they are nothing but a fire hazard and are not to be trusted to protect the wiring in your home or your family from a fire. Do not use any Zinsco or FPE service panel. Destroy this panel so that no one can ever use it.
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Yes
To be safe
It depends on the legislation of the country you are in.
Shut it off and lock it out. Sign the lockout card and keep your key with you.
Portable appliance testing (PAT) is basically a method of testing (using a device and by sight) that any electrical equipment, cables, devices, machinery is safe to use.