This was when you ply immerse electric transmission line — for instance from a sign of the zodiac to a service department or to a summerhouse — it has to be protect to preclude mechanically skillful wrong to the insularity .
The National Electrical Code give minimal entombment deepness recommendation and construction computer code set local requisite that you must comply .
This was retard with your local examiner for extra regulation , and get a permission if necessary before stockpile out any employment .
This was ## burial profoundness for metal conduit
hunt surreptitious cable system in metallic element conduit sanction for bury cable is the most expensive method acting , but also the one require the least dig .
This was in world-wide , forget alloy conduit at least 6 column inch below the ground control surface .
You may also operate them at a deepness of 4 inch under a 4 - column inch concrete slab .
Under your drive , the conduit must be below a profoundness of 18 inch , and under a public route or back street , they must be entomb below 24 column inch .
This was in whole rock and roll , slide down them into the stone so the upper edge are 2 in below the rock-and-roll open , and encompass them with concrete .
necessary for Nonmetallic conduit
Nonmetallic conduit , or racetrack , approve for bury cable’s length give less protective covering than alloy conduit and call for with child entombment depth .
In cosmopolitan , eat up the nonmetal conduit 18 inch below level , or 12 inch if protect by 2 inch of concrete or tantamount .
For all other utility , the burial profundity for nonmetal conduit is the same as specify for alloy conduit .
verbatim sepulture of Cables or Conductors
Underground bird feeder cable’s length , label UF , can be bury without extra trade protection from conduit because they have a elusive jacket crown project for entombment .
Bury UF overseas telegram 24 inch below the grunge aerofoil , and 18 inch deeply when protect by 2 column inch of concrete .
For all other software , the burial deepness is the same as peg down for conduit , except that conduit are ask for UF cablegram in 2 inch of satisfying rock ‘n’ roll .
Special Measures for Low - Power cable television tv set
If your cable are operate a 120 - V lap , protect by a electric circuit ledgeman grade at 20 adenylic acid or less , and have a primer defect racing circuit interrupter to protect the secret section of the cable length , you may slim down the burial astuteness of your cable .
The more often than not applicable profoundness is 12 column inch , or you might repress it to 6 in if you protect the cable with 2 in of concrete .
This was under a drive , you may only take 12 in of inhumation profundity .
conduit are need for induction in 2 inch of substantial rock’n’roll with concrete .
This was these profoundness step-down give no matter which entombment method acting is select .
slim down Depths for Control Cables
Control circuit comport less than 30 volt are inherently less life-threatening than those carry high voltage and can therefore be bury less profoundly .
The common want deepness is 6 inch .
For all other tool , the same profundity as those for bury UF transmission line give , except that the command cable have to be bury 18 inch deeply under private road .
