County of Los Angeles (San Gabriel Valley) (CA)

Codes

NEC Code Version

2023

Fire Code Version

2018 Building Code

Code List

2025 CALIFORNIA BUILDING CODE

2025 CALIFORNIA ELECTRICAL CODE

2025 CALIFORNIA FIRE CODE

2025 CALIFORNIA PLUMBING CODE

2025 CALIFORNIA MECHANICAL CODE

2025 CALIFORNIA ENERGY CODE

2025 CALIFORNIA RESIDENTIAL CODE

2025 CALIFORNIA ADMINISTRATIVE CODE

ASCE Code Specification

ASCE 7-16

SolarAPP+ & submittal

How Many Plansets Required

2

Revision Required

0

New Planset Required For Module Swap

0

Stamps

Ee Stamp Required On SLD

No

Wet Stamps Required

Digital Structural

Structural Calculations Required

Yes

Stamp Location On Plans

Unspecified

Date On Stamps

Expiration Date

Fire setbacks

Fire Setback Enforced

1

Setback Notes

Standard

Structural & loads

Wind Speed

110

Wind Notes

Exposure Category C

Snow Load

999

Snow Load Notes

* Elevations between 2000 and 3500 ft. require 20 psf snow load to be accounted for. * Elevations between 3500 and 5000 ft. require 40 psf snow load to be accounted for. * Elevations greater than 5000 ft. require 80 psf snow load to be accounted for. BCM1608 A1

Reducible Snow Load Allowed

1

Max Attachment Spacing

96

Structural Notes

Standard

Minimum Ground On Roof

#8

Electrical

AC Disconnect Required

Yes

Electrical Load Calcs Required

Derates

Allowed POI

Meter Adapter,PV Breaker,Load Side Taps,Line Side Taps

Panel Schedule Required

Partial Home Backup

Temperature Rating

75

De Rating Ampacity

0.96

BOS Restrictions

Standard

Battery / ESS

Unique Battery Placards Needed

0

ESS Notes

[LACOF]

This AHJ follows County of Los Angeles (ESS Requirements) (CA).

Please follow this link to County of Los Angeles (ESS Requirements) (CA)

ESS disconnect required within 6ft of MSP on same wall and not blocked by walls/gates/etc

If combining batteries need ESS disco/discos before the combiner panel

For Tesla Gateways:

• Add note to the single line diagram: “At the gateway, remove the Neutral-Ground Bond Strap.”
• Identify that the Hold Down Bar kit will be used for the internal load center of the Gateway 2 unit. This will satisfy the requirements of Section 408.36(D).

Separate ESS Disconnect Required

ESS Disconnect

ESS Elevation Detail Required

Yes - with dimensions

Plan set

Plan Set Requirements

BUS CERTS ARE NOT ACCEPTED IN THIS AHJ For multi inverter systems, specify which string each module is mapped to on plot plan. Refer to the multi inverter example below For ballast mount projects use PZSE (contact ) for structural engineering For MPUs, refer to the LA County MPU documents below ESS JOBS WILL NOW REQUIRE FIRE APPROVAL. REQUIREMENTS UPLOADED AS PDFs. A CHECKLIST IS ALSO REQUIRED.

For ground mounted PV arrays or PV arrays on detached structures, in addition to the equipment grounding conductor run with the PV system conductors, a grounding conductor shall be provided from the PV array to a grounding electrode system established at that ground mount or detached structure. (EX: #6 GEC to 2 ground rods, min 6’ apart located at the array structure) 690.47(A) Buildings or Structures Supporting a PV Array. A building or structure supporting a PV array shall have a grounding electrode system installed in accordance with Part III of Article 250. PV array equipment grounding conductors shall be connected a grounding electrode system in accordance with Part VII of Article 250. This connection shall be in addition to any other equipment grounding conductor requirements in 690.43(C). The PV array equipment grounding conductors shall be sized in accordance with 690.45.

Site

All Jobs

All buildings on property are to be properly labeled and called out as habitable or non-habitable.

Existing Systems: Show existing system size, new system size, and total system size.

Site Notes

All Jobs [ALL ELECTRICAL EQUIPMENT SHALL BE LABELED, LISTED, OR CERTIFIED BY A NATIONALLY RECOGNIZED TESTING LABORATORY ACCREDITED BY THE UNITED STATES OCCUPATIONAL SAFETY HEALTH ADMINISTRATION // NEW SERVICE PANEL TO REPLACE EXISTING AT SAME LOCATION]

Roof Plan

For systems with multiple strings/inverters, the plans shall clearly identify how all modules are mapped to each string and/or inverter input

For ballasted systems:

Section 110.13 requires all electrical equipment to be firmly secured, with a California Code exception for roof mounted PV systems provided that the wiring and interconnections are designed to accommodate for maximum system displacement. The electrical engineer is required to work with the civil/structural engineer for this project to determine the maximum physical displacement and to propose a method to accommodate such movement. This information shall be provided on the plans.

Attachment Detail

Distance from top of module to roof is to be called out

Electrical Diagram

FOR ALL PROJECTS If using sum of all breakers 705.12(B)(3)(3), specify a note on plans, include a list of all breakers in the main panel on the line digaram

FOR MPU PROJECTS If ground rods, comply with the following: 250.53(A)(2) & (3) Resistance of Electrodes: For the ground rod specified on the single line diagram, indicate that there shall be two ground rods separated by six or more feet Identify if the main panel is fed via an overhead drop or underground feed. If overhead, provide the size of the service entrance conductors AND ground size (GEC) Identify GEC size to Table 250.66 If solar ready MPU: Show model number for solar ready service panels

FOR HOT BUS PROJECTS If MSP is a hot bus and has 6 or less breakers, provide a panel schedule identifying all the breakers FOR GMA PROJECTS The wire from the inverter to the AC disconnect must also be sized to #6 Per SCE requirements, specify the distance from the GMA to the fused disconnect as 2-3' maximum Indicate that equipment grounding electrode conductor (EGC) shall be in separate conduit. The EGC is not installed in the liquid-tight flexible conduit from the AC disconnect to the GMA GMA requires GEC to be ran in its own conduit to MSP

Electrical Diagram Notes

All Jobs [THE PV BREAKER SHALL BE LOCATED AT THE OPPOSITE END OF THE MAIN BREAKER OR INPUT FEEDER // ALL TERMINALS TO BE RATED AT 75°C MINIMUM // All electrical work shall be designed per 2025 Los Angeles County electrical code, 2025 California Electrical Code, and 2023 National Electrical Code. // 110.2 Approval: All electrical equipment shall be labeled, listed, or certified by a Nationally Recognized Testing Laboratory accredited by the United States Occupational Safety Health Administration.] MPU [GEC SIZE IS #4 AWG 1 GROUND ROD TO BE INSTALLED WITHING 5' OF COLD WATER MAIN ENTERING THE HOME, CONNECTED VIA UL LISTED BONDING CLAMP // If proposed new main panel is located more than 6 feet from the existing main panel, combination-type AFCI breakers shall be used as a method of protection for all 15A/1P and 20A/1P (120V) loads per 210.12(D). // GEC SIZE FROM MAIN SERVICE PANEL TO GROUND ROD TO BE #4 AWG. SIZE OF GEC FROM PANEL TO METAL WATER PIPE TO BE #4 AWG // THE CONNECTION TO THE INTERIOR METAL WATER PIPING SHALL BE MADE WITHIN 5 FT FROM THE POINT OF ENTRANCE. PER SECTION 250.68(C)(1) // COLD WATER WITHIN 5 FEET AND AT LEAST ONE SUPPLEMENTAL ELECTRODE ARE REQUIRED (2 ground rods at least 6' apart is 1 supplemental electrode)] Battery [BACK UP LOAD CENTER WILL COMPLY WITH 210.12(A) USING AFCI BREAKERS // BOND GROUNDING SYSTEM IN BOTH BUILDINGS .NEUTRAL BUS AT SEPARATE BUILDING SHALL BE ISOLATED // THE SUB PANEL OR AC DISCONNECT SWITCH AT THE SEPARATE STRUCTURE SHALL BE SERVICE RATED 225.36 SUITABLE FOR SERVICE EQUIPMENT // THE DISCONNECT MEANS SPECIFIED IN SECTION 225.31 SHALL BE SUITABLE FOR USE AS SERVICE EQUIPMENT PER SECTION 225.36]

ADD THIS NOTE FOR TESLA POWERWALL BATTERIES [Hold Down Bar kit will be used for the internal load center of the Gateway unit]

Add note to the single line diagram: “At the gateway, remove the Neutral-Ground Bond Strap.”

Identify that the Hold Down Bar kit will be used for the internal load center of the Gateway 3 unit. This will satisfy the requirements of Section 408.36

Indicate the size of the largest backup load and its circuit breaker rating in the backup panel.

Add note to the single line diagram 710.15(A) Supply Output. The capacity of the stand-alone supply shall be equal to or greater than the load posed by the largest single utilization equipment connected to the system.

Label Page

* Provide a label identifying the rapid shutdown initiation device per 690.56(C)(3). 690.56(C)(3) Rapid Shutdown Switch. A rapid shutdown switch shall have a label located on or no more than 1 m (3 ft) from the switch that includes the following wording “RAPID SHUTDOWN SWITCH FOR SOLAR PV SYSTEM” When using the sum of all breakers method, the following label is required. * Permanent warning labels shall be applied to distribution equipment displaying the following or equivalent wording: WARNING: THIS EQUIPMENT FED BY MULTIPLE SOURCES. TOTAL RATING OF ALL OVERCURRENT DEVICES EXCLUDING MAIN SUPPLY OVERCURRENT DEVICE SHALL NOT EXCEED AMPACITY OF BUSBAR.

Ground mount

Ground Mount Fencing Required

Mesh/Scrim