Burial depth residential

[Stevenfyeager]

Table 300.5. Residential direct burial UF wire 120 v 20 amp is 18” or 12” if gfi protected, correct?
Not the 24” at the top of table?
Thanks

 

[infinity]

12", 20 amps or less, GFCI protected.

 

[Stevenfyeager]

12", 20 amps or less, GFCI protected.

Thanks, I had always gone by those numbers but I didn’t see a “yard” mentioned, only a residential driveway in that category. Then I just happen to see the top 24” number.

 

[wwhitney]

Table 300.5. Residential direct burial UF wire 120 v 20 amp is 18” or 12” if gfi protected, correct?
Not the 24” at the top of table?

Column 1 Row 1 is 24", so that's your minimum cover unless one of the other columns or rows applies.

Cheers, Wayne

 

[roger]

Thanks, I had always gone by those numbers but I didn’t see a “yard” mentioned, only a residential driveway in that category. Then I just happen to see the top 24” number.

So are you going under a drive way?

 

[infinity]

So are you going under a drive way?

According to post #3 it sounds like he's burying the cable in a "yard".

 

[roger]

According to post #3 it sounds like he's burying the cable in a "yard".

I wasn't sure if he wasn't crossing a driveway as mentioned in the same post.

 

[infinity]

I wasn't sure if he wasn't crossing a driveway as mentioned in the same post.

That would still be 12" of burial depth correct?

 

[roger]

No, it would be 24" per column 4

 

[infinity]

No, it would be 24" per column 4

Ok I'm going from memory. I thought that a residential driveway was the same 12" when there was GFCI protection and 20 amps or less.

 

[roger]

No, there is no relief for any driveway.

 

[wwhitney]

No, there is no relief for any driveway.

There are two different rows in Table 300.5: "Under streets, highways, roads, alleys, driveways, and parking lots" and "One- and two-family dwelling
driveways and outdoor parking areas, and used only for dwelling related purposes".

The former is always 24", while the latter is 18", or 12" for column 4 (residential, GFCI, 120V, 20A max).

Cheers, Wayne

 

[infinity]

The former is always 24", while the latter is 18", or 12" for column 4 (residential, GFCI, 120V, 20A max).

That's the way I remember it.

 

[roger]

There are two different rows in Table 300.5: "Under streets, highways, roads, alleys, driveways, and parking lots" and "One- and two-family dwelling
driveways and outdoor parking areas, and used only for dwelling related purposes".

The former is always 24", while the latter is 18", or 12" for column 4 (residential, GFCI, 120V, 20A max).

Cheers, Wayne

You are correct, sorry Rob

 

[mtnelect]

Depth requirements under residential driveways and parking areas. These depths are permitted for
one- and two-family residences

 

[Stevenfyeager]

Thank you all. The question I had was, I will be trenching in a yard, not under a driveway. The word yard wasn't mentioned in the Table. I assumed a yard would be the same or less depth than a driveway, but wasn't sure.

 

[wwhitney]

The word yard wasn't mentioned in the Table. I assumed a yard would be the same or less depth than a driveway, but wasn't sure.

Apparently not, for direct burial cable (column 1) in a residential yard (24") vs a residential driveway (18"). Unless you GFCI protect a 120V, <=20A circuit (column 4), in which case it's 12" either way.

Cheers, Wayne

 

[LarryFine]

RGS is good for only 6" and without a GFCI requirement or the 120/20a limit.

 

[Stevenfyeager]

RGS is good for only 6" and without a GFCI requirement or the 120/20a limit.

interesting

 

[Little Bill]

Thank you all. The question I had was, I will be trenching in a yard, not under a driveway. The word yard wasn't mentioned in the Table. I assumed a yard would be the same or less depth than a driveway, but wasn't sure.

If you look at Table 300.5, in the left column, under "location of wiring method or circuit", the very first listing says "All locations not specified below". Since you didn't see "yard", it isn't specified and you would use that column.