(a) Each plastic service line outside a building must be installed below ground level, except that--
(1) It may be installed in accordance with Sec. 192.321(g); and
(2) It may terminate above ground level and outside the building, if--
(i) The above ground level part of the plastic service line is protected against deterioration and external damage; and
(ii) The plastic service line is not used to support external loads.
(b) Each plastic service line inside a building must be protected against external damage. [35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-78, 61 FR 28785, June 6, 1996]