The orange stuff is NM cable...

NEC

300.5

(B). Wet Locations. The interior of enclosures or raceways installed underground shall be considered to be a wet location. Insulated conductors and cables installed in these en-closures or raceways in underground installations shall be listed for use in wet locations and shall comply with 310.8(C). Any connections or splices in an in wet locations and shall comply with 310.8(C). Any connections or splices in an underground installation shall be approved for wet locations.

300.9

Raceways in Wet Locations Above Grade.Where raceways are installed in wet locations abovegrade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceways in wet locations abovegrade shall comply with 310.8(C).

310.8

(C) Wet Locations. Insulated conductors and cables used in wet locations shall comply with one of the following:

(1) Be moisture-impervious metal-sheathed

(2) Be types MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THWN, THWN-2, XHHW, XHHW-2, ZW

(3) Be of a type listed for use in wet locations.

334.12 Uses Not Permitted

(B) Types NM and NMS. Types NM and NMS cables shall not be used under the following conditions or in the following locations:

(1) Where exposed to corrosive fumes or vapors

(2) Where embedded in masonry, concrete, adobe, fill, or plaster

(3) In a shallow chase in masonry, concrete, or adobe and covered with plaster, adobe, or similar finish

(4) In wet or damp locations.

Something is wrong. 10/3 NM-B (suitable for dry locations) would be orange and UF-B (suitable for wet locations) would be gray. If you were having Home Depot cut it for you, maybe the spool was in the wrong place on the rack (8/3 or 6/3 would have a black jacket). Or you were looking at 10/3 cord, which would be used as a power cord on an tool. Cord would be pretty flexible and the jacket would be kind of "rubbery."

As Fred mentioned, even if you are using conduit, running it along the outside the house is considered a wet location, so you would have to use UF-B or individual wires rated for a wet location.

UNDERGROUND is always wet. Conduit above ground may or may not be a wet location.

Yes, you need to carefully read what is printed on the cable rather than relying on color. The sheath color, while fairly standard, isn't determining. Cordage typically will have a hyphen between the size and the number of conductors rather than a /. Of course, the TYPE (SO, NM, UF, etc...) will tell you what you are really dealing with.

Some other observations: You shouldn't be running cable in conduit other than for protection from physical damage. Note that if you have more than one circuit at the remote structure, it requires a grounding system (rods typically) of it's own.

If the conduit is outside, it is either a damp or wet location in most cases. NM is not allowed in either.

Location, Damp. Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some coldstorage warehouses.

Location, Dry. A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction.

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.

Hello to all who answered , you are all very much appreciated - and right of coarse . The orange 10/3 mn wire was given to us and - told it was ok to use for our purpose - however because we had previously and after checked the different 10/3 wires we were skeptical - hence the question because we are sure there smarter folks out there than us and maybe it really was ok . So very glad we did and we have of coarse purchase the one rated for underground and will not use the orange one - gave it back with thanks for the offer . Thanks so much !