3 hole outlet on ungrounded line

[Ed Melo]

I have seen some older houses where some of the outlets have been replaced with 3 hole outlets although the line going to them do not have a ground wire.

Is the only good solution to this problem replacement of the wiring?

Would you replace ALL the ungrounded wiring ? I'm sure this could be expensive but is it safe to leave the ungrounded wiring in place?

[Ed Melo]

Originally posted by "TC":

If its a rental and if you ever want a Section 8 tenant, it has to be grounded. They test every outlet. Either replace it with a 2 prong or ground it directly to the metal box. Pull the plug out, hook a ground wire to the outlet and screw it to the box. Buy yourself a ground tester for 2 bucks and make sure it lights up correctly.

Just connecting a ground wire to the box will not ground the plug. You still need to bring a ground wire back to the service panel. If the cable used is armored cable then that would serve as a ground wire.