County of Arapahoe (CO)

Codes

NEC Code Version

2023

Fire Code Version

2018 Building Code

Code List

2021 INTERNATIONAL BUILDING CODE

2021 INTERNATIONAL RESIDENTIAL CODE

2021 INTERNATIONAL PLUMBING CODE

2021 INTERNATIONAL MECHANICAL CODE

2021 INTERNATIONAL FUEL GAS CODE

2021 INTERNATIONAL EXISTING BUILDING CODE

2021 INTERNATIONAL SWIMMING POOL AND SPA CODE

2021 INTERNATIONAL ENERGY CONSERVATION CODE

2023 NATIONAL ELECTRICAL CODE

ASCE Code Specification

ASCE 7-16

SolarAPP+ & submittal

SolarAPP+ Status

Targeted

Any SolarAPP+ Restrictions

1

SolarAPP+ Restrictions

MPU,Derate

How Many Plansets Required

1

Revision Required

1

Rough Inspection

Footing inspection

New Planset Required For Module Swap

1

Stamps

Ee Stamp Required On SLD

No

Wet Stamps Required

Digital Structural

Structural Calculations Required

Yes

Stamp Location On Plans

Unspecified

Date On Stamps

Date Plans are Stamped

Fire setbacks

Fire Setback Enforced

1

Setback Notes

Standard

Structural & loads

Wind Speed

115

Wind Notes

Exposure Category C

Wind Speed in the Engineer Letter to include 3 Second Gusts.

Snow Load

30

Snow Load Notes

* Provide the snow load calculation sheet and specify the roof snow load as 30 psf non reducible. The letter from the engineer must verbally state a 30 psf non-reducible roof snow load.

Reducible Snow Load Allowed

0

Max Attachment Spacing

96

Structural Notes

Engineer letter must list 2021 IRC

Wind Speed in the Engineer Letter to include 3 Second Gusts.

The engineer’s general summary report (Engineer Letter) must state verbatim "The existing structure is adequate for the additional solar panel load and no reinforcement is needed

The engineer's calculation letter & calcs must include calculations for all roof surfaces with new PV modules

Please ensure plans, Engineer letter & calculations report reflect all items on the attached Arapahoe County Checklist in the files section below.

This is a long list, please ensure both CE and PE follow the items on the checklist

Add Arapahoe County Checklist to notes to vendor on stamping task

Minimum Ground On Roof

#10

Electrical

AC Disconnect Required

Yes

Electrical Load Calcs Required

Derates

Allowed POI

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

Panel Schedule Required

Partial Home Backup

Service Ground Requirements

When upsizing the ungrounded conductors above the minimum ampacity required, the EGC must be upsized by the same proportion.

Temperature Rating

90

De Rating Ampacity

0.96

Battery / ESS

Unique Battery Placards Needed

0

ESS Notes

1\. The mounting detail for the battery needs an engineer's stamp; this page in the plans is labeled "Roof Plan w/ Modules Layout". 2\. Provide installation instructions for the battery in the plans. 3\. Provide installation instructions for the back-up load center in the plans. 4. Clarify the location of interconnection for the back-up load center. 5\. Please include the location, required fire detection, and any required protection from impact, where applicable, on the plan set

For SolarEdge Energy Bank Backup Systems, Please include On and Off Grid Inverter Note on ELD. As well as a 100A Disco for the 63A Chint Breaker in the Backup Interface.

Separate ESS Disconnect Required

Gateway Disconnect

ESS Elevation Detail Required

Yes - with dimensions

Plan set

Plan Set Requirements

All references to AC ratings throughout the plans must show actual calculations, not maximum inverter or other equipment ratings. Arapahoe County has accepted the System Size boxes throughout the plans to show the calculated AC size of DC kW x the Maximum Inverter Efficiency; and include the following calculations: PV SYSTEM (AC): x.xxx kW @ 240V (x.xxx kW DC x 99.2% INV. EFF). Please see attached AC System Size Example screenshot for reference. Edit title block manually to accommodate this request.

Please ensure plans, Engineer Letter & Structural calcs fully adhere to the attached Arapahoe County PV Checklist, as plan reviews are taking 12-16 weeks to complete.

Site

All jobs (not just GM) show distance to property lines

Site Notes

All Jobs [Aerial view (site plan) must include dimensions of all roof surfaces, modules and fire walk paths.]

Roof Plan

The aerial view includes dimensions of all roof surfaces to have PV modules installed on, and includes all dimensions and locations of all roof PV modules

Provide dimensions showing the installers where arrays start and stop with detailed measurements from roof edges including ridges, gables, eaves and hips/valleys.

Electrical Diagram

* For projects with production meters, please use min #6 AWG THWN-2 from inverter to POI. * For projects without PM, wire may be sized to inverter requirements (no longer #6 min). * One line diagram must state the PV breaker location; Example: PV breaker located at opposite end of main breaker in main service panel. * Please include only one SLD page for plan-sets to avoid inspection confusion in field. * When upsizing the ungrounded conductors above the minimum ampacity required, the EGC must be upsized by the same proportion. **Taps** * **Cannot tap in MSP, must use separate enclosure** * For line/load side tap provide MSP manufacturer’s information and UL listing documentation pertaining to the line/load side service taps being permitted/allowed within the existing electrical enclosure & provide information on the method used for a line/load side tap inside the enclosure on plan sheet. The AHJ basically wants to see documentation from the load center manufacturer (also providing UL listings) stating that taps are allowed inside their load centers; it may be simpler to avoid using taps within this AHJ. **Batteries** * For battery systems, please provide complete SolarEdge wiring instructions that include connections to autotransformer & inverter.

*For Existing Systems/Equipment: Please indicate the wire size.

*For SolarEdge Energy Bank Backup Systems, please include On and Off Grid Inverter Note on ELD. As well as a 100A Disco for the 63A Chint Breaker in the Backup Interface.

Electrical Diagram Notes

• One line diagram must state the PV breaker location ; Example: PV breaker located at opposite end of main breaker in main service panel.
• Electrical plans include the path of the raceways or cables, e.g., through the attic, on the roof, underground. 
• All conductors are identified as DC or AC conductors on line diagrams
• All conductor material (copper) must be called out on line diagram
• Load calcs must use county assessor sq ft for lighting load

Placards Notes

For Core Utility projects

Ground mount

Ground Mount Fencing Required

Mesh/Scrim

Ground Mount Requires Soil Sample

Soil Study