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Section 8-904

California Historical Building Code (Title 24, Part 8) · 2019 edition · updated 2026-09-10 · California

CBSC: official editions, supplements and errata

ELECTRICAL 8-904.1 General. Electrical systems shall comply with the regular code unless otherwise permitted by this code, or approved by the authority having jurisdiction.

8-904.1.1 The provisions of the CHBC shall apply to the acceptance, location, installation, alteration, repair, relocation, replacement or addition of any electrical system or portion thereof, the premise wiring, or equipment fixed in place as related to restoration within or attached to a qualified historical building or property.

8-904.1.2 Existing systems, wiring methods and electrical equipment which do not, in the opinion of the enforcing agency, constitute a safety hazard may remain in use.

8-904.1.3 The enforcing agency may approve any alternative to the CHBC which achieves equivalent safety.

8-904.1.4 Archaic methods that do not appear in present codes may remain and may be extended if, in the opinion of the enforcing agency, they constitute a safe installation.

8-904.2 Wiring methods.

8-904.2.1 Where existing branch circuits do not include an equipment grounding conductor and, in the opinion of the enforcing agency, it is impracticable to connect an equipment grounding conductor to the grounding electrode system, receptacle convenience outlets may remain the nongrounding type.

8-904.2.2 Ground fault circuit interrupter (GFCI) protected receptacles shall be installed where replacements are made at receptacle outlets that are required to be so protected by the regular code in effect at the time of replacement. Metallic face plates shall either be grounded to the grounded metal outlet box or be grounded to the grounding-type device when used with devices supplied by branch circuits without equipment grounding conductors.

8-904.2.3 Grounding-type receptacles shall not be used without a grounding means in an existing receptacle outlet unless GFCI protected. Existing nongrounding receptacles shall be permitted to be replaced with nongrounding or grounding-type receptacles where supplied through a ground fault circuit interrupter.

8-904.2.4 Extensions of existing branch circuits without equipment-grounding conductors shall be permitted to supply grounding-type devices only when the equipment grounding conductor of the new extension is grounded to any accessible point on the grounding electrode system.

8-904.2.5 Receptacle outlet spacing and other related distance requirements shall be waived or modified if determined to be impracticable by the enforcing agency.

MECHANICAL, PLUMBING AND ELECTRICAL REQUIREMENTS

8-904.2.6 For the replacement of lighting fixtures on an existing nongrounded lighting outlet, or when extending an existing nongrounding lighting outlet, the following shall apply:

  1. The exposed conductive parts of lighting fixtures shall be connected to any acceptable point on the grounding electrode system, or

  2. The lighting fixtures shall be made of insulating material and shall have no exposed conductive parts.

Exception: Lighting fixtures mounted on electrically nonconductive ceilings or walls where located not less than either 8 feet (2438 mm) vertically or 5 feet (1524 mm) horizontally from grounded surfaces. 8-904.2.7 Lighting load calculations for services and feeders may be based on actual loads as installed in lieu of the “watts per square foot” method.

8-904.2.8 Determination of existing loads may be based on maximum demand recordings in lieu of calculations, provided all of the following are met:

  1. Recordings are provided by the serving agency.

  2. The maximum demand data is available for a oneyear period.

Exception: If maximum demand data for a oneyear period is not available, the maximum demand data shall be permitted to be based on the actual amperes continuously recorded over a minimum 30-day period by a recording ammeter connected to the highest loaded phase of the feeder or service. The recording should reflect the maximum demand when the building or space is occupied and include the measured or calculated load at the peak time of the year, including the larger of the heating or cooling equipment load.

  1. There has been no change in occupancy or character of load during the previous 12 months.

  2. The anticipated load will not change, or the existing demand load at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service.

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

22 2019 CALIFORNIA HISTORICAL BUILDING CODE Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

CHAPTER 8-10

QUALIFIED HISTORICAL DISTRICTS, SITES AND OPEN SPACES

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▸Contents — California Historical Building Code (Title 24, Part 8)
California Historical Building Code (Title 24, Part 8)
  1. Section 8-101
  2. Section 8-102
  3. Section 8-103
  4. Section 8-104
  5. Section 8-105
  6. Section 8-106
  7. Section 8-201
  8. Section 8-301
  9. Section 8-302
  10. Section 8-303
  11. Section 8-401
  12. Section 8-402
  13. Section 8-403
  14. Section 8-404
  15. Section 8-405
  16. Section 8-406
  17. Section 8-407
  18. Section 8-408
  19. Section 8-409
  20. Section 8-410
  21. Section 8-411
  22. Section 8-412
  23. Section 8-501
  24. Section 8-502
  25. Section 8-503
  26. Section 8-504
  27. Section 8-601
  28. Section 8-603
  29. Section 8-602
  30. Section 8-604
  31. Section 8-701
  32. Section 8-702
  33. Section 8-703
  34. Section 8-704
  35. Section 8-705
  36. Section 8-706
  37. Section 8-801
  38. Section 8-802
  39. Section 8-803
  40. Section 8-804
  41. Section 8-805
  42. Section 8-806
  43. Section 8-807
  44. Section 8-808
  45. Section 8-809
  46. Section 8-810
  47. Section 8-812
  48. Section 8-811
  49. Section 8-901
  50. Section 8-902
  51. Section 8-903
  52. Section 8-904
  53. Section 8-1001
  54. Section 8-1002
  55. Section 8-1003

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