# Box fill question

#### ExtraordiNary

##### Member
Help in answering a box fill question. Seems like the process to answer is different when dealing with wire #4 and higher.

If I have 2 1/0
1 #6
2 #8
1 # 4
What size box would I use.
Thanks

#### jumper

##### Senior Member
You would have to use 314.28 to get minimum box size.

#### ExtraordiNary

##### Member
Thanks

Thanks

Am I reading it right that I would have to size the wire according to what raceway it would fill going into box, then times it by 8 or six times the raceway to get minimum box. Or am I totally confused.

Side question:
The conductors that are between the utility and service point of connection? Would that be service entrance conductors? What's the difference in service entrance and service lateral. Thanks

##### Senior Member
Jumper, am I right that this section sizes boxes based upon not the wire size but the raceway size, and then also refers to a bending diameter for any wires? But everything is based upon the raceways or conduits?

#### ggunn

##### PE (Electrical), NABCEP certified
Jumper, am I right that this section sizes boxes based upon not the wire size but the raceway size, and then also refers to a bending diameter ...
I apologize for the nitpicking, but it's bending radius, not diameter. Diameter is twice the radius.

#### jumper

##### Senior Member
Jumper, am I right that this section sizes boxes based upon not the wire size but the raceway size, and then also refers to a bending diameter for any wires? But everything is based upon the raceways or conduits?
Yes.

#### jumper

##### Senior Member
I apologize for the nitpicking, but it's bending radius, not diameter. Diameter is twice the radius.
Good catch, I didn’t even notice.

#### jumper

##### Senior Member
Am I reading it right that I would have to size the wire according to what raceway it would fill going into box, then times it by 8 or six times the raceway to get minimum box. Or am I totally confused.

Side question:
The conductors that are between the utility and service point of connection? Would that be service entrance conductors? What's the difference in service entrance and service lateral. Thanks
Yes, that is the idea. If you using cables, you use the cable connector size as if was conduit size.

Look at the definitions in 100. Lateral is usually slang for a underground service.

Thanks

#### jumper

##### Senior Member
Of course, no problem.

This scenario is tricky and we all are here to learn.