225.22

[fmtjfw]

Section/Paragraph: 225.22

Revised Text

225.22 Raceways on Exterior Surfaces of Buildings or Other Structures.
Raceways on exteriors of buildings or other structures shall be arranged to drain and shall be suitable listed for use in wet locations.

Substantiation

Requiring raceways to be listed for wet location is reasonable. Suitable is a bit wishy-washy (pun intended).

Listed for wet location is used in 300.50(B), 310.10(C)(3), 314.15, 330.10(A)(11)c., 366.6(A)(2), 366.120(2), 396.10(B)(2), Table 400.4 Note 9, 410.96, 547.5(C)(2), 547.8(C), 550.15(H), 725.179(E), and 760.179.

Inserted Deleted

 

[petersonra]

Section/Paragraph: 225.22

Revised Text

225.22 Raceways on Exterior Surfaces of Buildings or Other Structures.
Raceways on exteriors of buildings or other structures shall be arranged to drain and shall be suitable listed for use in wet locations.

Substantiation

Requiring raceways to be listed for wet location is reasonable. Suitable is a bit wishy-washy (pun intended).

Listed for wet location is used in 300.50(B), 310.10(C)(3), 314.15, 330.10(A)(11)c., 366.6(A)(2), 366.120(2), 396.10(B)(2), Table 400.4 Note 9, 410.96, 547.5(C)(2), 547.8(C), 550.15(H), 725.179(E), and 760.179.

Inserted Deleted

There is nothing wrong with the phrasing as is IMO.

I suspect the phrasing comes from the way UL lists stuff as being suitable for certain conditions.

Products are typically listed to a specific standard and then designated as being suitable for specific conditions such as wet locations.

 

[fmtjfw]

Say the same thing using the same words?

Say the same thing using the same words?

There is nothing wrong with the phrasing as is IMO.

I suspect the phrasing comes from the way UL lists stuff as being suitable for certain conditions.

Products are typically listed to a specific standard and then designated as being suitable for specific conditions such as wet locations.

So is there some difference in meaning in "listed for wet locations" and "listed as suitable for wet locations"?

The style manual states:

3.3.5 Parallel Construction. Parallel construction means stating similar requirements in similar ways for greater consistency. This helps makes the NEC clear for users. Lack of consistency often creates confusion, causing users to ask: Does this difference in wording represent a different requirement? Or is it simply two different ways of trying to say the same thing?

I don't believe the two constructs are meant to have different meanings. They seem to appear randomly throughout the Code.

 

[don_resqcapt19]

I don't see anything in the UL Guide Information for Rigid Ferrous Conduit (DYIX) that says rigid is specifically listed for use in wet locations. Changing the wording from suitable to listed will result in some inspectors rejecting the use of rigid conduit in wet locations because the Guide Information does not use those words.

 

[fmtjfw]

I don't see anything in the UL Guide Information for Rigid Ferrous Conduit (DYIX) that says rigid is specifically listed for use in wet locations. Changing the wording from suitable to listed will result in some inspectors rejecting the use of rigid conduit in wet locations because the Guide Information does not use those words.

DYIX:
Galvanized rigid steel conduit installed in concrete does not require supplementary corrosion protection.
Galvanized rigid steel conduit installed in contact with soil does not generally require supplementary corrosion protection.

100 Definitions.
Location, Wet. Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.

The locations allowed for RMC quoted from DYIX are listed as wet locations in 100.

344.10(A)(1) Uses Permitted. Atmospheric Conditions and Occupancies. Galvanized Steel and Stainless Steel RMC.
Galvanized steel and stainless steel RMC shall be permitted under all atmospheric conditions and occupancies.

All atmospheric conditions includes wet locations.


344.10(D) Uses Permitted. Wet Locations.
All supports, bolts, straps, screws, and so forth, shall be of corrosion-resistant materials or protected against corrosion by corrosion-resistant materials.

So RMC requires hardware that meets "310.15(D)" and under 314.10 is for Wet Locations.


Further Article 344 contains no .12 section (uses not permitted). The NEC is a permissive code, that which is not forbidden is permitted.

314.15 Damp or Wet Locations.
In damp or wet locations, boxes, conduit bodies, outlet box hoods, and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within the box, conduit body, or fitting. Boxes, conduit bodies, and fittings installed in wet locations shall be listed for use in wet locations.


So all the things attached to the RMC are required to be listed for use in wet locations, but the conduit itself is not, only "suitable"?

 

[don_resqcapt19]

DYIX:
Galvanized rigid steel conduit installed in concrete does not require supplementary corrosion protection.
Galvanized rigid steel conduit installed in contact with soil does not generally require supplementary corrosion protection.

100 Definitions.
Location, Wet. Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.

The locations allowed for RMC quoted from DYIX are listed as wet locations in 100.

344.10(A)(1) Uses Permitted. Atmospheric Conditions and Occupancies. Galvanized Steel and Stainless Steel RMC.
Galvanized steel and stainless steel RMC shall be permitted under all atmospheric conditions and occupancies.

All atmospheric conditions includes wet locations.


344.10(D) Uses Permitted. Wet Locations.
All supports, bolts, straps, screws, and so forth, shall be of corrosion-resistant materials or protected against corrosion by corrosion-resistant materials.

So RMC requires hardware that meets "310.15(D)" and under 314.10 is for Wet Locations.


Further Article 344 contains no .12 section (uses not permitted). The NEC is a permissive code, that which is not forbidden is permitted.

314.15 Damp or Wet Locations.
In damp or wet locations, boxes, conduit bodies, outlet box hoods, and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within the box, conduit body, or fitting. Boxes, conduit bodies, and fittings installed in wet locations shall be listed for use in wet locations.


So all the things attached to the RMC are required to be listed for use in wet locations, but the conduit itself is not, only "suitable"?

The white book does not use the words "listed for wet locations"...if you put those words in the then you can't use the conduit in a wet location unless they change the white book. You will open a huge can of worms....it has probably never been tested for wet locations

Just look at how much a threaded coupling leaks as compared to the old EMT compression couplings....but now you have to use a special raintight EMT coupling in a wet location, even though the only couplings don't leak near as much as a rigid or IMC coupling does.

 

[fmtjfw]

DYIX Galvanized rigid steel conduit

DYIX Galvanized rigid steel conduit

This conduit is subject to UL6 testing. UL6 testing for galvanized includes a "humid" test:

length 60 days
temperature 60?C
98 +/- 2% humidity
at end no corrosion present to pass.

 

[iwire]

This conduit is subject to UL6 testing. UL6 testing for galvanized includes a "humid" test:

length 60 days
temperature 60?C
98 +/- 2% humidity
at end no corrosion present to pass.

It gray and heavy as well but that still does not make it 'listed for wet locations'.