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Here is the information directly out of the electrical code in reference to liquidtight flexible conduit.
Liquidtight Flexible Metal Conduit (LFMC). A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors.350.6 Listing Requirements.LFMC and associated fittings shall be listed.II. Installation350.10 Uses Permitted.LFMC shall be permitted to be used in exposed or concealed locations as follows: (1) Where conditions of installation, operation, or maintenance require flexibility or protection from liquids, vapors, or solids (2) As permitted by 501.10(B), 502.10, 503.10, and 504.20 and in other hazardous (classified) locations where specifically approved, and by 553.7(B) (3) For direct burial where listed and marked for the purpose Liquidtight flexible metal conduit (LFMC) is intended for use in wet locations or where exposed to mineral oil, both at a maximum temperature of 140°F. LFMC is not intended for use where exposed to gasoline or similar light petroleum solvents unless so marked on the product. LFMC is required to be a listed product. If properly marked for the application, LFMC is permitted for direct burial in the earth. Note that the requirements of 300.5 are applicable to LFMC if installed underground. LFMC is on the permitted list of wiring methods allowed for services (230.43), provided the length does not exceed 6 ft and an equipment bonding jumper is installed in accordance with 250.102. LFMC may be installed in unlimited lengths, provided it meets the other requirements of Article 350 and a separate equipment grounding conductor is installed with the circuit conductors.Liquidtight flexible nonmetallic conduit (LFNC) is also used extensively in the machine tool and related industries. See 13.5.5 in NFPA 79-2007, Electrical Standard for Industrial Machinery, for the uses permitted on an industrial machine.350.12 Uses Not Permitted.LFMC shall not be used as follows: (1) Where subject to physical damage (2) Where any combination of ambient and conductor temperature produces an operating temperature in excess of that for which the material is approved350.20 Size.(A) Minimum. LFMC smaller than metric designator 16 (trade size 1/2) shall not be used.Exception: LFMC of metric designator 12 (trade size 3/8) shall be permitted as covered in 348.20(A).(B) Maximum. The maximum size of LFMC shall be metric designator 103 (trade size 4).
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If all your doing with the conduit is running it underwater to another location and then up again - you will not have any problems using liquidtight flexible conduit. But you cannot have any breaks in the conduit where you would put a coupler together where it is submerged under water. As for your outlet boxes that will be obove the water line, you will need to have weather proof boxes with "in-use" covers for when you have appliances and such plugged into them.
These supplies I speak of are available at any electrical supply house or home improvement center.
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