Elec Svc

ELECTRICAL SERVICE (AMP/CEC regulations)

  • A valid permit and plans must be on-site R106.3.1
  • All work must be done in a neat, workmanlike manner CEC 110.12

  • Service size:
    • > 250 amps and > 3 meters cannot be an express permit
    • ≤ 250 amps no restrictions
    • 251-399 amps require written AMP approval
    • ≥ 400 amps requires AMP approval and an owner-supplied transformer
  • Minimum service:
    • Single-family_____100-amp 
    • Multi-family______60-amp 
    • Attached ADU____100-amp
    • Detached ADU____100-amp
    • Jr ADU___________no requirements (separate service not allowed)
  • Conduit:
  • Rigid ≥ 1.25” and threaded CEC 230.50
  • No LB or gutter between the panel and weather-head
  • Double strap on conduit at the corner
  • Clamp riser within 3′ of the service panel    
  • Conductor ≥ 24” proud of the weather-head
  • The point of attachment may be on the building or periscope < 18″ from the roofline and must be 12′-18′ above grade
  • Weather-head:
    • ≥ 8“ beyond the edge of the roof
    •  ≤ 24″ from the svc attachment point
    • 18″-48″ above the roof
    • > 30″ above the roof requires bracing – bracing shall be 2 galvanized braces (3/4″ rigid or 1-1/4″ x 1-1/4″ x 1/8″ steel angle iron) secured to framing with 3/8″ x 3″ lag screws with a 90-degree spread and secured to the periscope ≤ 6″ below the point of attachment
  • Drip loop CEC 230.54.F

Service Overhead Clearances CEC 230.24

  • ≥ 8’ above roofs < 4:12 pitch
  • ≥ 3’ above roofs ≥ 4:12 pitch
  • ≥ 18” at eaves
  • ≥ 18’ above nonresidential driveways
  • ≥ 10’ above walkways
  • ≥ 12’ above driveways
  • ≥ 18’ above roadways
  • ≥ 3’ from windows or other openings

Ampacity Chart CEC 310.16

Amp Gauge Copp/Alum AWG or kcmil

15 _____#14

20 _____#12

30_____ #10

40_____#8

50_____#6

60_____ #6

100____ #4 – 2

110 _____#3 – 1

125 _____#2 – 1/0

150 _____#1 – 2/0

175_____ 1/0 – 3/0

200 _____2/0 – 4/0

225 _____3/0 – 250

250_____ 4/0 – 300

300 _____250 – 350

350 _____350 – 500

400 _____400 – 600

Panel

  • Surge Protection: shall be an integral part of the svc equipment. Exception: if located at each next level distribution equipment downstream.
  • Panel ≥ 10” from the corner to the edge of the meter
  • Power in the top of the meter and out the bottom
  • The service panel must be on the AMP-approved list and EUSERC compliant (Electrical Utility Service Equipment Requirements Committee)
  • The side of the panel to the gas riser must be ≥ 3’ clear
  • Max Breaker height ≤ 6’7” CEC 404.8
  • The panel must be labeled CEC 110.22.A
  • Secure conductors entering the panel CEC 312.5.C
  • No double lugging on neutral conductors
  • Arc-Flash hazard: warning label required on service gear ≥ 1,200 amps, other than dwelling units CEC 110.16.B
  • Knockouts must be filled CEC 110.12.A
  • Working clearances: CEC 110.26
  • Meter ≥ 3’ from the property line
  • No gate between the street and the meter
  • Conduits below grade: requires duct seal at 1, or both ends CEC 300.5.G
  • Meter height:
    • 48-66”
    • 72-75” (near driveway)
  • GFCI: Ground fault protection of equipment shall be provided for solidly grounded wye electrical services of > 150 volts to ground but not exceeding 1000 volts phase-to-phase for each service disconnect rated 1,000 amps or > CEC 230.95
    • What does this mean? 1,000 amps and 277/480 and above require it. 120/240 or 208 are exempt

Grounding/Bonding

1-L-535-1Download
1-L-628-1Download