wewire2
Valid point on the where do you stop bringing up to code. Insuring that no one gets shock and no fires would be main concern. Some codes are for convenience only and just make life easier.
406.3 (D)(1)
If a grounding conductor EXISTS in the receptacle enclosure than a grounding type recept. SHALL be used.
I agree with everyone on checking continuity of EG and tap from existing grounds. Plus the code requires the use of them if they exist in the enclosure.
I would consider using some arc faults on the bedroom circuits and gfci in kitchen and baths.
