There were more than 350 changes to the 2010 California Electric Code (2008 NEC). The following is a summary of some of the significant changes. Please refer to the exact code language for a complete explanation of the changes.
1. Article 100 – There are several new definitions in this article including:
Bonded and Bonding, Branch-circuit Overcurrent Device, Clothes Closet, Device, Ground, Grounded, Grounding Conductor (EGC), Neutral Conductor and Neutral Point, Qualified Person, Short-circuit Current Rating, Surge-Protective Device, Deteriorating Agents (see article 100 for explanation of new terms)
2. Article 110 - Table 110.20 Enclosure Types relocated from 430.91
3. Article 210 Branch Circuits:
210.4(A) and (B) Each multiwire branch circuits shall be provided with a means that will simultaneously disconnect all ungrounded conductors of that circuit.
210.5(C) - Identification of conductors by phase and voltage required.
210.8(A)(2) & (A)(5) – GFCI protection required for all receptacles located in a garage or basements. The exceptions have been deleted.
210.8(B) - Outdoor receptacles at other then dwelling units are required to be GFCI protected.
210.12(B) - In dwellings, AFCI protection is now required in all rooms except kitchens, baths and garages.
4. 240.24(F) - Panel boards shall not be located over stairs.
5. Article 250 – There are several new definitions relating to grounding and bonding.
6. 250.32 – Equipment grounding conductors required for branch circuits and feeders supplying a second building.
7. 300.5 (C) – Cables under a building must be installed in a conduit and must also be wet location rated.
8. 300.9 – Conductors and cables installed in conduits located in wet locations must be wet location rated.
9. 310.15(B)(2)(c) - Conduits exposed to sunlight on roof tops, see new temperature adjustment table.
10. 314.4 – All metal boxes are required to be grounded and bonded.
11. Article 334 Nonmetallic Sheathed Cable (Romex):
334.12(B) – Romex is not permitted in wet or damp locations.
334.15(C) – Romex installed in craw spaces must be protected. Cables smaller than # 8/3 or # 6/2 are no longer allowed to be secured/stapled to the bottom edge of floor joists.
334.80 – Conductor ampacity derating, in accordance with table 310.15(B)(2)(a), is required for cables installed in contact with thermal insulation, fire stopping or draft stopping without maintaining spacing (i.e. 50% derating for five two wire cables that are bundled together)
12. 338.10 – Type SE cable not allowed underground unless in conduit. Type USE cable is not allowed to be used for wiring in the interior of buildings.
13. Article 355 – A new article for Reinforced Thermosetting Resin Conduit
14. 376.56 – Power distribution blocks installed in a wire way (gutter boxes) must not have uninsulated live parts.
15. Chapters 4, 5 & 6 – Where a disconnecting means is required to be lockable in the open (off) position the provisions for locking must remain in place whether the lock is in place or not.
16. 404.9(B)(1) – A switch may be grounded by connection to a grounded metal box.
17. 406.8(A) & (B) – Receptacles installed in wet or damp locations must be listed weather-resistant type.
18. 406.11 – All dwelling unit receptacles required by 210.52 are required to be listed tamper-resistant receptacles.
19. 408.3(F) – Permanent field marking required for switch boards and panel boards with High-Leg – 120/240 volt Delta with one phase at 208 volt to ground.
20. 408.36 – The definitions for lighting and appliance panel boards and power panel boards have been deleted.
21. Article 410 – Luminaries, Lamp holders and Lamps, The term light fixture has been deleted.
22. 422.52 – Electric drinking fountains must be GFCI protected.
23. 430.103 – Motor disconnects that close (turn on) automatically, such as time clocks, are not permitted as the primary disconnecting means.
24. Chapter 5 – There are numerous changes in Chapter 5 especially in Article 517 Health Care Facilities
25. Article 625 – Electric Truck Parking Space, a new article in the 2008 NEC
26. Article 680 – Swimming Pools
680.12 maintenance disconnect required to be located a minimum of 5 feet from inside wall of the pool.
680.22(A) receptacles shall be located a minimum of 6 feet from inside wall of the pool.
680.22(B) all pool pump motors are required to be GFCI protected.
680.26 This entire section was reorganized to clarify the equipotential bonding grid requirements.
680.71 a separate branch circuit is required for hydormasage bathtubs. GFCI protection required.
27. 690 Solar Photovoltaic Systems
690.4 - equipment, such as inverters, modules, combiner boxes and charge controllers, is required to be listed
690.31(A) PV source and output circuits in readily accessible locations shall be installed in conduits.
690.47(D) an additional grounding electrode is required for a ground mounted PV array.