Wire Cost: Difference between revisions
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=About= | =About= | ||
*NM-B house wire is specified for 60C by the NEC, but it can withstand 90C. [https://www.menards.com/main/electrical/electrical-wire-cable/indoor-electrical-cable/12-2-type-nm-b-cable-with-ground-wire/sku3691335/p-1474478926948-c-6441.htm] | *NM-B house wire is specified for 60C by the NEC, but it can withstand 90C. [https://www.menards.com/main/electrical/electrical-wire-cable/indoor-electrical-cable/12-2-type-nm-b-cable-with-ground-wire/sku3691335/p-1474478926948-c-6441.htm] | ||
*2AWG is rated for 95A at 60C, 1 AWG is rated for 110 at 60C [https://www.lapptannehill.com/resources/technical-information/ampacity-chart] | *2AWG is rated for 95A at 60C, 1 AWG is rated for 110 at 60C [https://www.lapptannehill.com/resources/technical-information/ampacity-chart] | ||
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*Romex or BX wire can be run without conduit - [https://www.quora.com/Can-I-run-THHN-wires-through-an-attic-without-a-conduit] | *Romex or BX wire can be run without conduit - [https://www.quora.com/Can-I-run-THHN-wires-through-an-attic-without-a-conduit] | ||
**Romex goes up to 2 awg [https://wesbellwireandcable.com/blog/thhn-vs-romex/#:~:text=Romex%C2%AE%20wire%20is%20available,(AWG)%20to%202%20AWG.] | **Romex goes up to 2 awg [https://wesbellwireandcable.com/blog/thhn-vs-romex/#:~:text=Romex%C2%AE%20wire%20is%20available,(AWG)%20to%202%20AWG.] | ||
=Subpanels= | |||
*Since 2008, 4-wire cable is required. [https://structuretech.com/subpanels-when-the-grounds-and-neutrals-should-be-separated/#:~:text=Another%20way%20to%20wire%20a,have%20to%20be%20connected%20together.] | |||
*SER cable is preferred, no conduit needed [https://nassaunationalcable.com/blogs/blog/how-to-wire-a-subpanel#:~:text=Since%20non%2Dmetallic%20sheathed%20cable,options%20when%20wiring%20a%20subpanel.]. XHHW and THHN can be used but require conduit. | |||
=Cost= | =Cost= | ||
Revision as of 23:56, 15 May 2023
About
- NM-B house wire is specified for 60C by the NEC, but it can withstand 90C. [1]
- 2AWG is rated for 95A at 60C, 1 AWG is rated for 110 at 60C [2]
- USE-2, RHW-2 and RHH - sunlight, heat, moisture resistant [3]
- Aluminum ampacity - 1/0 aluminum does 100A at 60C. Good chart of wire types and their T resistance [4]
- Terminations at panels must be rated at 60C - [5] - thus you must specify wire for 60C. For example, if you want 100A, oversize 100A 90C wire to something larger at whose 60C rating you get the required ampacity.
- THHN to subpanel - yes if in conduit - [6]
- Standard practice - individual THHN through conduit or NM-B through stud holes [7]
- Romex or BX wire can be run without conduit - [8]
- Romex goes up to 2 awg [9]
Subpanels
- Since 2008, 4-wire cable is required. [10]
- SER cable is preferred, no conduit needed [11]. XHHW and THHN can be used but require conduit.