3-52 Log #2257 NEC-P03 Final Action: Accept in Principle
(300.9 (New) )
Submitter: Donald A. Ganiere, Ottawa, IL
Comment on Proposal No: 3-63
Recommendation: This proposal should be accepted.
Substantiation: I understand that panel’s point that conductors must be
selected so that they are suitable for the locations where they are being
installed. The point of this proposal is to make it clear that the interior of any
raceway installed in a wet location is a wet location. That is not a completely
accepted idea in the field. A section was added, 300.5(B) in a previous code
to make it clear that the interior of all underground raceways is a wet location.
This is the same issue with raceways that are installed in wet locations. The
interior of the raceway will be a wet location and conductors or cables installed
in these raceways must be listed as suitable for use in wet locations. If the
interior of raceways in outside or wet locations is not also a wet location, why
do sections 225.22 and 230.53 require that “raceways on exteriors of buildings
or other structures shall be arranged to drain”? Note: This proposal covers
underground raceways and raceways in wet locations and if accepted, you
should also accept Proposal 3-43.
Panel Meeting Action: Accept in Principle
Revise recommended text for 300.9 to read:
300.9 Raceways in Wet Locations Above Grade. Where raceways are installed
in wet locations above grade, the interior of these raceways shall be considered
to be a wet location. Insulated conductors and cables installed in raceways in
wet locations above grade shall comply with 310.8(C).
Panel Statement: The panel accepts the recommendation to create a new
300.9 for aboveground wet locations and has chosen to place the underground
installation requirements in 300.5(B). The text was not deleted in 300.5(B)
since this entire Section 300.5 applies to underground installations. Providing
additional underground requirements in a new 300.9 could be missed by the
user of the Code. The requirement for using wet location listed conductors
in the proposal was changed to “complying with 310.8(C)” because there are
three different methods to comply with insulated conductors and cables used in
wet locations. They must be:
(1) Moisture-impervious metal-sheathed;
(2) Types MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THHW-2,
THWN, THWN-2, XHHW, XHHW-2, ZW; or
(3) Of a type listed for use in wet locations.
See the panel action and statement on Comment 3-20a (Log #CC300).
Number Eligible to Vote: 13
Ballot Results: Affirmative: 13
Comment on Affirmative:
CASPARRO, P.: See my explanation of vote on Comment 3-20a.