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Fastening shall be permitted to be increased to a distance of 1.5 m (5 ft) where structural members do not readily permit fastening within 900 mm (3 ft). Where approved, conduit shall not be required to be securely fastened within 900 mm (3 ft) of the service head for above-the-roof termination of a mast. The purpose of this national electric code is to reduce the use of extension cords. From any point along a wall line, a receptacle outlet needs to be within reach of a 6-ft. Appliance cord, and that 6 ft. Cannot be measured across a passageway.
By Jerry Walch, 26th Feb 2014 Short Website http://nut.bz/2fsmqwq/
Submitted in WikinutGuidesDIYElectrical
Submitted in WikinutGuidesDIYElectrical
The NEC, Bar 70 of the NFPA, is certainly the electrician's bible, and models down the guidelines which electrician's must stick to when installing electrical systems. The criteria established down in the NEC are minimum criteria, which may end up being much less than the local requirements, therefore always check out with the local authority having jurisdiction before starting any wires task. This write-up will try to make easier NEC needs for subterranean wiring techniques.
Planning for Subterranean Wiring projects
The very first issue that you need to perform when considering any task that requires digging is certainly to contact the locator services and have them mark the location of smothered electrical cables and fuel water lines.If you reside in any of the fifty says, you can end up being place in contact with your local locator solutions by dialing 811. 2nd, after the locator services flags the location of hidden wires and gasoline ranges, you require to choose upon the subterranean wiring technique you will employ-rigid conduit, intermediate avenue, PVC avenue, or direct burial cable or cable connection. 3 rd, you need to contact the regional authority having jurisdiction and inquire about their needs for the wiring method you would like to utilize. The regional rules may possess requirements that exceed those of the National Electrical Rules.
National Electrical Code Installation Requirements
. Immediate burial cable or wire needs to be buried a least of 18 inches below the cement covering.
. Rigid Metal Channel or Intermediate Metal Channel wants to become smothered at minimum 6 ins below the concrete.
. Nonmetallic conduit (PVC) not housed in concrete needs to be a minimum of 12 inches below the 2 inch cement pad.
. 120-volt, max 20-Ampere home part circuits with GFCI protection requires to end up being hidden at minimum 6 ins below the 2 inch concrete covering.
. Low-voltage (30-volts or much less) circuits for landscaping lamps or irrigation settings, sent with type-uf or some other approved wire, demands to become situated at least 6 inches below the concrete covering.
Installations beneath a Minimum amount of 4 Ins of Concrete with the Concrete Extending 6 inches to each side of the Wiring and no Vehicular Traffic Over the wiring:
. Immediate burial cable or cable -18 inches below the concrete covering.
. Stiff or Intermediate Metal Avenue - 4 in . below the concrete covering.
. PVC without cement encasement - 4 ins below the concrete covering.
. 120-volt, max 20-Ampere home branch circuits with GFCI security wants to be smothered at minimum 4 ins below the 2-inch concrete covering.
. Low-voltage (30-volts or much less) circuits for landscape designs lights or irrigation controls, wired with type-uf or additional approved cable, desires to be situated at least 6 ins below the concrete covering.
Smothered Under Roads, Driveways, Streets, Alleys, and Car parking Lots:
. Direct burial cable or cable requirements to become buried a minimum amount of 24 in . deep.
. Stiff or More advanced Metal Avenue - 24 inches deep.
. PVC without concrete encasement - 24 inches deep.
. 120-volt, max 20-Ampere residential branch circuits with GFCI security requires to become left at minimum 24 inches deep.
. Low-voltage (30-volts or much less) circuits for landscaping design lamps or irrigation settings, wired with type-uf or some other approved cable, needs to end up being situated at minimum 24 ins deep.
Installation Under one- and Two-Family Homes Driveways and their Outdoor Car parking Areas:
. Direct burial wire or cable needs to be buried a minimum of 18 ins deep.
. Rigid or Intermediate Metal Conduit - 18 in . deep.
. PVC without cement encasement - 18 in . deep.
. 120-volt, max 20-Ampere residential part circuits with GFCI defense demands to be left at least 12 ins deep.
. Low-voltage (30-volts or less) circuits for landscaping lights or irrigation handles, sent with type-uf or some other approved wire, desires to become situated at least 18 ins deep.
For Installations under Buildings:
. Immediate burial cable or wire installed in an approved raceway desires to become buried 0 ins beneath the building.
. Rigid or More advanced Metal Avenue - 0 ins deep.
. PVC without cement encasement - 0 ins deep.
. 120-volt, max 20-Ampere residential part circuits in an authorized raceway with GFCI security desires to become left 0 inches deep.
. Low-voltage (30-volts or much less) circuits for landscape designs lights or irrigation settings, born with type-uf or other approved cable, set up in an authorized raceway-0 inches deep.
For any Installation not specified above:
. Immediate burial wire or cable-24 inches deep.
. Rigid or More advanced Metal Channel - 6 ins deep.
. PVC without concrete encasement - 18 in . deep.
. 120-volt, max 20-Ampere home branch circuits in an approved raceway with GFCI security wants to become smothered 12 inches deep.
. Low-voltage (30-volts or much less) circuits for landscape designs lamps or irrigation settings, wired with type-uf or other approved cable connection, set up in an accepted raceway-6 in . deep.
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