Box sizing
- Thread starter Vertex
- Start date
- Status
- Location
- Massachusetts
Last edited:
Thank you, Bob. I've read through this sections several times before asking. I still need some clarification.
If I am interpreting this correctly, a calculation must be done to determine what size raceway would theoretically accommodate the conductors. If so, how would I find the area of the conductors? I don't think the area for SE cable is listed in the NEC. Also, no specific raceway is mentioned.
Is it just me or is this section a little bit ambiguous?
- Location
- Massachusetts
Truthfully I have never put much thought into it, I tend to oversize boxes but yeah it seems a bit hard to nail down if you where being tested on it.
- Location
- Massachusetts
BTW, I like the signature.
DARUSA
Senior Member
- Location
- New York City
Ser
Ser
SE cable or SER cable usually have THHN or THWN wire insulation!!!
Ser
SE cable or SER cable usually have THHN or THWN wire insulation!!!
DARUSA
Senior Member
- Location
- New York City
THHN or THWN
THHN or THWN
#2 area inch. 0.1158
#8 area inch 0.0366
Probably you will have 8#2 and 2#8 ground
Do your math!!!!
THHN or THWN
#2 area inch. 0.1158
#8 area inch 0.0366
Probably you will have 8#2 and 2#8 ground
Do your math!!!!
- Location
- New Jersey
- Occupation
- Journeyman Electrician
The stuff we use, AL SEU and SER is always XHHW.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
This response leads to the question to the OP:
Is this two cables in and two out, or one in and one out?
(20 to go!)
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
As I read 314.28 it states for cables or raceways. Iguess you would use the connector size for the cable.
For straight pulls
For U Pulls
For angle pulls
For straight pulls
For U Pulls
For angle pulls
DARUSA
Senior Member
- Location
- New York City
Aluminum ?
DARUSA
Senior Member
- Location
- New York City
You right I mixed in my mine splice boxe and pull boxe calculation.
4 #2 + 1 #8 to find conduit size!
I assume the answer to his question is; one cable in and one out.
Next question to ask is; where is the cables entering the box?
DARUSA
Senior Member
- Location
- New York City
But you need to know what size conduit you need for the wires , in this case probable 1-1/4 or 1-1/2 then size your box based on the location of the cables (straight or angle pull).
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Why would there be four #2 and one #8 in each raceway? The OP is trying to splice two 4/2 SE cables. Each cable would contain three #4 XHHW conductors or possibly two #4 and one #6 conductors. You use the equivalent raceway size for each cable not for all the conductors in all the cables. Three #4 XHHW conductors can easily fit into a 1" raceway.
All SE cable I have seen has contained XHHW conductors.
All SE cable I have seen has contained XHHW conductors.
As I read 314.28 it states for cables or raceways. Iguess you would use the connector size for the cable.
For straight pulls
For U Pulls
For angle pulls
Good job Dennis looks good:grin:
I don't like the idea of making assumptions, but let's assume the following for the sake of argument;
One cable in and one cable out (position in box irrelevant)
Both SE cables are 4/2 w/ #6 bare ground
Insulated conductors are type XHHW
Theoretical conduit to be considered is EMT
Based on my calculations, the minimum conduit size is 3/4".
Minimum box size is 4-1/2" square (A 4-11/16" square box would work)
Before making any condemnations, please understand that I have not advocated using the minimum standard for this application.
One cable in and one cable out (position in box irrelevant)
Both SE cables are 4/2 w/ #6 bare ground
Insulated conductors are type XHHW
Theoretical conduit to be considered is EMT
Based on my calculations, the minimum conduit size is 3/4".
Minimum box size is 4-1/2" square (A 4-11/16" square box would work)
Before making any condemnations, please understand that I have not advocated using the minimum standard for this application.
My quote is "tongue-in-cheek" expression regarding America. I believe it parallels the concept of "bread and circuses".
Here's a history lesson.
http://en.wikipedia.org/wiki/Bread_and_circuses
Here's a video of the song.
http://www.youtube.com/watch?v=dVGINIsLnqU&ob=av2e
Here's the lyrics.
We're victims of sedition on the open sea
No one ever said life was free
Sank, swam, go down with the ship
Just use your freedom of choice
I'll say it again in the land of the free
Use your freedom of choice
Freedom of choice
In ancient Rome there was a pawn
Who followed along and watched it fall
He cast a stone, he felt secure
He felt that he would never be heard
Freedom of choice
Is what you got
Freedom of choice
You're given a voice you don't want it
Seems to be the rule of thumb
Don't be tricked by what you see
You got two ways to go
I'll say it again in the land of the free
Use your freedom of choice
Freedom of choice
Freedom of choice
Is what you've got
Freedom of choice
In ancient Rome there was a pawn
Who followed along and watched it fall
He cast a stone, he felt secure
He felt that his voice would never be heard
Freedom of choice
Is what you've got
Freedom from choice
Is what you want
Freedom of choice
Is what you've got
Freedom from choice
Is what you want
Freedom from choice
Is what you want
Freedom from choice
~Devo
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