Satisfying Disconnect Requirement

ESS Systems

Last Post by BobAndRoslyn 1 month ago

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look4terry

Topic starter

December 7, 2024 4:46 pm

(@look4terry)

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We just received approval for a permit to install a PV array, EG4 18KPV Hybrid Inverter, and 2 EG4 Wall Mount ESS. To mitigate an issue with the that stated:

CEC Article 706.15 Disconnecting Means
A disconnecting means shall be provided for all ungrounded conductors derived from an ESS and shall be permitted to be integral to listed ESS equipment.

The disconnect must be readily accessible, close, and lockable open.

The engineer from Solar Wholesale responded by putting two external 200 amp disconnect switches on the battery cables, one from each battery. See the attached diagram. This does not seem correct. It also will make the install more complicated and not be able to use the standard cables. How can we satisfy this requirement?

Thanks,
Terry

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ESS Disconnect

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Posts: 102

JLankford

December 7, 2024 9:33 pm

(@jlankford)

Estimable Member

Joined: 2 months ago

@look4terry

It sounds like you have a vendor that is trying to charge you for more stuff you don't need.

Each of the batteries have a circuit breaker disconnect. And there is a battery disconnect breaker on the inverter. The disconnect on the inverter can be considered to be lockable since it is behind the 18Kpv cable box access door, which has keyed latches.

Note that NEC 706.15 (D) states that circuit breakers are an acceptable means of disconnect.

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BobAndRoslyn

(@bobandroslyn)

Joined: 3 months ago

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Posts: 31

December 12, 2024 5:24 pm

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JLankford

@look4terry , I agree w/ @jlankford. For my installation here in Michigan we had a conversation the electrical inspector regarding our installtion to get their feedback before having any of the work done. I suspect they'll agree the breakers on each battery are sufficient.

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Jared

Admin

December 9, 2024 6:40 pm

(@jared)

Online Support

Joined: 3 months ago

Several wiring diagrams for the 18kPV in an ESS can be found on our website. However, the 706.15 regulation is typically the one referenced for rapid shutdown, although interpretations can vary depending on the AHJ.

https://eg4electronics.com/categories/ess-systems/power-pro-wallpower-all-weather-ess/#:~:text=SUPPORT%20BULLETINS%20(TSB)-,WIRING%20DIAGRAMS,-EG4%C2%AE%2018KPV%20%E2%80%93%20SYSTEM

Satisfying Disconnect Requirement

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