In your case I would be looking at the following to give me confidence in any decision on code and length between inspections, not having seen the installation some of the questions may be irrelevant:
1 -Is the conduit in the concrete galv or painted?
2 - Are the visible joints in the conduit well made and painted with zinc paint or other protective coating?
3 - Is the concrete encasing the conduit dry or damp?
4 - Are the R2 values for all parts of the conduit all good and reasonable for the lengths involved?
5- Are the conduit terminations at the origin well made and not subject to corrosion?
6 - In the shower areas how is the LSF cable earths attached to the conduit?
In your case I would be looking at the following to give me confidence in any decision on code and length between inspections, not having seen the installation some of the questions may be irrelevant:
1 -Is the conduit in the concrete galv or painted?
2 - Are the visible joints in the conduit well made and painted with zinc paint or other protective coating?
3 - Is the concrete encasing the conduit dry or damp?
4 - Are the R2 values for all parts of the conduit all good and reasonable for the lengths involved?
5- Are the conduit terminations at the origin well made and not subject to corrosion?
6 - In the shower areas how is the LSF cable earths attached to the conduit?
