Update and more questions
I talked with the electrical inspector. The electrical wires and the water pipe (Pex) can be side by side, whether the wires are UF-B or THWN in conduit. We're like the idea of putting the wires in conduit for all the reasons already stated. When our basement was poured, we had the contractor put in a 2" PVC sleeve for the waterr line, thinking that would suffice for both water and electrical. Now we realize that it isn't large enough for both 1" Pex (1 1/8" OD) and conduit (we don't want to try pulling 5 wires through a small diameter conduit (Dear husband wants to use 2").
So we're thinking of doing it like this:
Install 2" PVC conduit for individual THWN wires - 1 each black and red 10 gauge, 1 green 12 gauge, and 1 each black and white 14 gauge - 5 wires in all. The conduit will be laid in the ditch beside the Pex water line. At the junction with the house, we will only feed the Pex through the 2" PVC sleeve that is through the basement wall. Where the electrical conduit intersects the basement, we'll add a long sweep elbow to bring it up above grade so that the wires can be fed through the band, above the basement wall. (Our basement wall has 2" foam insulation and stucco on the outside so we don't want to drill another hole through that.)
My questions concern the place where the wires enter the house. From what I understand we can put a LB fitting at this location to have a waterproof elbow where the wires turn to enter the house. Do these wires then go to an interior junction box mounted inside on a joist? Is this acceptable to have splice in the wire at this location or should the wires be continuous all the way to the pressure tank? (I've also seen mention of an exterior junction box that could be used in lieu of the LB fitting and interior box, but the same question concerning the splice applies.)
Since we're running wires for both the pump and the light, do we need to have a separate junction box for each or will the one box suffice?
One more question... does anyone use lubricant on the wires for easier pulling? If so, what do you use?
Update and another question
As per advice, we are using 10 ga red and black for the pump and 12 ga black and white for the light. We were going to get 12 ga green for the ground but they didn't have enough at Lowes so we paid a little extra to get 10 ga ground wire which they had in stock.
We decided to run 1 1/4" conduit to the house and then up to the band. (The 2" sleeve in the basement wall, originally for the water line only, isn't large enough for conduit and the 1" Pex.) At the band, we'll put a 1 1/4" LB fitting and then run the conduit through to a junction box that will be mounted on the inner band. (The basement wall is 10" thick. The last of the "joists," installed on 16" centers, actually sits on top of the inner edge of that 10" concrete wall and the outer band sits on the outside edge. We'll have to go through both of these.)
Now for my question. We want to mount a junction box so that the 1 1/4" conduit intersects with the back of the box. Then we want to have two 3/4" junctions going out the side and bottom of the box. One will 3/4" outlet will go to the pressure tank; the other will go to the panel box. Here's a photograph showing the fittings. In the photo, the face that is up would actually be rotated to vertical and mounted to the side of the inner band (a 2 x 12).
https://lh6.googleusercontent.com/-H...nction_box.jpg
My husband was familiar with junction boxes that had knockouts, but the ones we found at Lowes were solid, so I assume that we drill for the size hole we need and insert the conduit adapter through that hole. Then use a a coupling to join the conduit to it. Are there any restrictions as to where holes are drilled in these junction boxes? It will be installed inside so moisture isn't an issue. There may be a better way, but if you think this will work, we've already got the parts and are ready to install them. Feedback is welcomed.
