Is stranded wire inferior to solid core wire in this situation?

[MiniMe4Eng]

I have to run 2x20A and 1x15A circuits on the outside of the house for like 9m (27') -that is RW90 in conduit.

I have been trying without success to find solid core wire (individual wires) cut by meter. I would have to buy a 300m spool. Even if I use the same color for all the wires and use tape to mark the ground/neutral and hot I am still under 100m.

From what I am seeing it would be maybe easier to get stranded core.
My plan is to get with exterior rated cable to inside of the house and there to connect using a junction box with NMD cables which will be easier to push pull through the finished ceiling (there is insulation there)

From what the vendors told me this wire is more popular because it is easier to pull but from what I am reading technically it is less performant.

Are there any major problems that I should be aware of when using stranded wire ?

 

[BN4537]

Where is this being applied? The terminations are 75C rated so you can't use 90C ratings for the wires where they terminate.

First of all, I apologize for hijacking a Canadian electrical code question. What I really would like to know is if the Canadian code allows the same thing the NEC does, which is as follows:

The 90C the 12 AWG NM cable is rated for is used per 334.80 in the NEC, which is 30 amps per Table 310.16. If you have 8 conductors, you have a 70% "derate" (ampacity adjustment), which means that you could carry 21 amps on that wire. If you protect that wire with a 20 amp breaker, you would be compliant because the wire is now considered to be 21 amp wire after the derate. This link articulates my point of view more clearly and at length: https://forums.mikeholt.com/threads/clarification-on-334-80.2554040/

The termination is 75C, but it is considered separately from the ampacity adjustment because the wires are not bundled at the terminal and therefore are not producing heat in that area. At least in NEC world.

 

[waross]

Common ground is fine — just must be sized to largest required (CEC Table 16, typically #10 for 15A/20A circuits)

More A1 bullshit.

 

[waross]

Waross, a forum isn't a place for experts to validate each other. That would be pointless. It's a place for people to say things, sometimes incorrect, and get corrected. This thread has a lot of that going on and that's a good thing.

I guess that things change.
Originally Eng-Tips was intended for engineers to share valid accurate information with their peers.
There was no place in the original Eng-Tips for this type of uninformed guessing.
Before the change in management, many of these posts would have been deleted and the posters chastised. At times posters were banned from the site when it became obvious that they were not engineers.
At one time, way back when, only work related posts were acceptable.
Home related electrical posts, even by respected electrical gurus, where deleted as not "Work related".

You haven't been on Eng-Tips long enough to tell us what it is.

 

[LionelHutz]

The management change was for the worst for sure.

 

[waross]

Almost EVERY industrial or commercial site in North America is using stranded wires pulled through conduit.

Respectfully Lionel.
That was my experience working in the office.
In the office we are mainly concerned with feeders and motor feeds.
By default, #8 and larger will be stranded.
In the field we see thousands of feet of #14 and #12 pulled out of lighting panels.
Solid or stranded is seldom specified.
Purchasing agents tend to save a few cents and go with solid.
A lot of #12 and #14 stranded is pulled but it is by no means universal.
A lot of industrial lighting tends to be TECK which is stranded in all sizes.

From what the vendors told me this wire is more popular because it is easier to pull but from what I am reading technically it is less performant.

Free internet advice MiniMe. The difference is vanishingly small.
Follow my advice to use RTV filled Variable Volume Wire Nuts and sleep easy.
Your problem is more colours than solid/stranded. Use what you can get.

 

[waross]

Almost EVERY industrial or commercial site in North America is using stranded wires pulled through conduit.

Respectfully Lionel.
That was my experience working in the office.
In the office we are mainly concerned with feeders and motor feeds.
By default, #8 and larger will be stranded.
In the field we see thousands of feet of #14 and #12 pulled out of lighting panels.
Solid or stranded is seldom specified.
Purchasing agents tend to save a few cents and go with solid.
A lot of #12 and #14 stranded is pulled but it is by no means universal.
A lot of industrial lighting tends to be TECK which is stranded in all sizes.