Article 240 overcurrent protection.
Gfci protected underground feeder cable.
Initially it was only required for temporary wiring at construction sites and in dwelling unit bathrooms but in recent years.
In an effort to safeguard even more electrical installations the nec has expanded requirements for gfci type receptacles.
Article 250 grounding.
Bury uf cables 24 inches below the soil surface and 18 inches deep when protected by 2 inches of concrete.
Article 310 conductors for general wiring.
Q i have a 400 ampere service supplied by a three phase four wire delta system.
Underground feeder uf b solid or stranded type thhn thwn conductors are laid parallel with an uninsulated grounding conductor with overall outer pvc jacket.
Underground wire for a residential circuit usually is installed with underground feeder uf cable which is rated for outdoor use and direct burial such an installation is typical when running a circuit to an outdoor location such as a garage shed or other outbuilding or to a yard light or water feature.
Article 408 switchboards and panelboards.
Permitted for use underground including direct burial in earth as feeder or branch circuit cable where provided with overcurrent protection.
For a 12 in deep trench you can direct bury gfci protected underground feeder cable with a short length of pvc conduit at the house.
Three phase four wire delta service.
At 18 inches you can use thwn 2 conductors inside a continuous length of pvc conduit which protects the wire all the way through the trench to the house.
Type uf underground feeder cable permitted to be used to supply service entrances.
Article 300 wiring methods.
Known as uf for underground feeder the cable has a heavier plastic sheathing than the romex used inside the house.
Outlet receptacles for general use can be no closer than 20 feet from a pool or in ground spa if they are not gfci protected and no closer than 6 feet away if they are gfci protected.
On in ground pools there must be at least one gfci protected convenience outlet located between 6 feet and 20 feet from the edge of the pool.
As with installing indoor wiring there are some rules to follow.
Underground feeder cables labeled uf can be buried without additional protection from conduits because they have a tough jacket designed for burial.
Both methods have to be gfci ground fault circuit interrupter protected before the wires enter the ground to guard against electrocution in case.
Gfci protected circuit to an outdoor pole light run under a paved driveway is.
Most of the rules involve protection of the wiring from damage.
Lighting track in residential installations shall not be cut to length in the field unless permitted by the.
We recommend the pvc conduit because it offers more protection against physical damage.
A second method 12 in.
