Does the backyard ADU need...

[Ponchik]

Based on 225.41, does a backyard (ADU, in-law unit) need an emergency disconnect o the outside?

TIA

 

[roger]

It needs a disconnect per 225.31 and 225.32

 

[ramsy]

Based on 225.41

Is that a future code adoption?

 

[Dennis Alwon]

Google search

"TIA 225.41" primarily refers to two distinct topics depending on the context: an electrical safety code and a banking regulation.

In the Electrical Code Context
In the context of electrical wiring and safety, TIA 225.41 refers to Tentative Interim Amendment (TIA) 70-23-1, which modified Section 225.41 of the 2023 edition of the National Electrical Code (NEC).

• Requirement: This section mandates an emergency disconnecting means for all one- and two-family dwelling units. This shutoff is required to be installed in a readily accessible outdoor location, on or within sight of the dwelling unit.
• Purpose: The TIA clarifies that this requirement applies even if the unit is supplied by a feeder (e.g., in a backyard Accessory Dwelling Unit or an in-law unit), not just a service entrance. This ensures emergency responders can quickly and safely cut all power to the building from the outside.

 

[ramsy]

TIA 225.41" primarily refers to two distinct topics depending on the context: an electrical safety code and a banking regulation.

Thanks for that clarification.
I was reading TIA as, “thanks in advance.”

 

[roger]

Thanks Dennis.

 

[don_resqcapt19]

225.41 became a rule in the 2023 code. There was no Tentative Interim Amendment (TIA) for this in the 2020 code. This is simply a new rule in the 2023 code building on the dwelling unit emergency disconnect rule found in 230.85 of the 2020 code.

 

[don_resqcapt19]

Google search

I have no idea of where Google got that but TIA 23-1 has nothing to do with 225.41. Per the NFPA TIA 23-1, Reference: 250.114(3)e and 250.114(4)e.

I find no TIA (Tentative Interim Amendment) related to 225.41 in either the 2020 or the 2023 code.

225.41 was added to the 2023 code by First Revision 7706, in response to Public Input 2913 that sought to add a dwelling unit emergency disconnect rule to 225.31. The panel thought it would be better to have the emergency disconnect rule for one and two family dwellings that are supplied by a feeder in its own section so they created 225.41.

 

[ramsy]

I have no idea of where Google got that but ..NFPA TIA 23-1, Reference: 250.114(3)e and 250.114(4)e.

Google's AI used indiscriminate concatenation of strings end-to-end, to join the wrong code sections, and hallucinated this as the answer.

A most interesting report claims AI developers have no way to correct this behavior.

Arthur C. Clarke's Hal-9000, and James Cameron's SkyNet appear unstoppable.

 

[don_resqcapt19]

and hallucinated this

yep, even the promotion for the newest release of openAI's says "reduced halluciations

 

[Ponchik]

So, an ADU needs an outdoor mounted disconnected.

 

[tortuga]

There is a slight difference in the NEC between a 'guest suite' and a 'dwelling unit' most ADU's here are 'guest suites'

 

[Ponchik]

There is a slight difference in the NEC between a 'guest suite' and a 'dwelling unit' most ADU's here are 'guest suites'

Never crossed my mind to check the definitions.

ADU here is a dwelling unit.

 

[qcroanoke]

So, an ADU needs an outdoor mounted disconnect.

Judging by Don's answer in post#7,
Yes.

 

[tortuga]

Never crossed my mind to check the definitions.

ADU here is a dwelling unit.

Here it is mainly a zoning / planning dept issue. A 'dwelling unit' here triggers about 3X the permit fees, gets separate USPS address, many other codes apply, permits take a long time for approval.
A 'guest suite' is relatively easy to permit and the difference is really minor it may even be just the presence of a range I forget.

 

[jaggedben]

So in California you have another couple weeks to pull the permit or the disconnect needs to be on the outside. Still need a main disco (or 6 or less) if on the inside.

There is a slight difference in the NEC between a 'guest suite' and a 'dwelling unit' most ADU's here are 'guest suites'

The 'DU' in 'ADU' stands for 'dwelling unit'.