State of Washington (L&I) (WA)

Washington Authority Having Jurisdiction Solar permitting requirements

NEC Code Version2023

Fire Code Version2018 Building Code

Wet Stamps RequiredDigital Structural

Fire Setback Enforced1

Codes

NEC Code Version: 2023

Fire Code Version: 2018 Building Code

Code List

2021 INTERNATIONAL BUILDING CODE

2021 INTERNATIONAL RESIDENTIAL CODE

2021 INTERNATIONAL FIRE CODE

2021 INTERNATIONAL ENERGY CONSERVATION CODE

2021 INTERNATIONAL EXISTING BUILDING CODE

2021 INTERNATIONAL FUEL GAS CODE

2021 INTERNATIONAL MECHANICAL CODE

2021 INTERNATIONAL PLUMBING CODE

2023 NATIONAL ELECTRICAL CODE

HUD 24CFR3280 Manufactured Home Construction Safety Standards

ASCE Code Specification: ASCE 7-16

SolarAPP+ & submittal

Revision Required: 0

New Planset Required For Module Swap: 0

Stamps

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: 85

Snow Load: 999

Snow Load Notes: https://hazards.atcouncil.org/#/

Reducible Snow Load Allowed: 1

Max Attachment Spacing: 96

Structural Notes

Example of AHJ Correction for Manufactured homes below.

See attached correction letter in files section for further information

code cycles must show 2021. PE Letter and Calcs required

The actual code path utilized shall be clarified in the engineering / certification letter.

Minimum Ground On Roof: #10

Electrical

Electrical Load Calcs Required: Derates

Allowed POI: Meter Adapter,PV Breaker,Load Side Taps,Line Side Taps

Panel Schedule Required: Partial Home Backup

Supply Tap Neutral Ground Bond Required: 1

Temperature Rating: 90

De Rating Ampacity: 0.91

Battery / ESS

Unique Battery Placards Needed: 0

ESS Notes: Standard

Separate ESS Disconnect Required: ESS Disconnect

ESS Elevation Detail Required: No

Plan set

Plan Set Requirements

If the property is a manufactured home, they require 2021 ICC codes and 2023 NEC. They also require 24 CFR Part 3280 to be listed in codes list.

Also stamped plans and calcs are required if it's a manufactured home.

For all Trenches

2 Disconnects required - one at each end of trench
Required for AC or DC trenches

Attachment Detail: If property is a manufactured home and we are using deck mount, update the embedment length to 0.5".

Electrical Diagram

Per AHJ, a communication wire is supposed to be run separate from other wires (in a separate conduit)

For all Line Side Connections:

Neutral and ground bonded in fused disconnect
#6 bare copper run from N/G bar to (E) MSP's GEC and crimped
Schedule 80 PVC must be used in between fused disconnect and MSP - only showing 2 hots and neutral
All other conduit can be EMT

For all Load Side Taps:

Schedule 80 PVC must be used in between disconnect and MSP

Custom Placards Required: 0

Non Standard Revision Requirements

Revisions/Reworks on Manufactured Homes:

All plan items, which have been modified within the plans, shall be clouded.
All revised sheets shall have the revision dates modified to show most recent revision date. The response letter shall also contain the date of the resubmittal to insure proper review order. Without the date the project may have another placed in front of it.
An itemized response letter is required.
The responses located in the required response letter should include a narrative answer. Answers such as "see page X" will general not convey a complete message and may delay the project review and or approval.

Ground mount

Ground Mount Fencing Required: Mesh/Scrim