Romex in Detached Garage

[volt102]

May NM be used in a residential detached garage without a thermal barrier of material that has at least a 15-minute finish rating?

(1)One- and two-family dwellings.
(2)Multifamily dwellings permitted to be of Types III, IV, and V construction except as prohibited in 334.12.

Then there is (3)

Dwelling Unit. A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.

This question arises from a seminar yesterday.

Jim Grant
Rochester, New Hampshire

 

[George Stolz]

I'd consider the detached garage to be a part of a dwelling unit, given the structure of 210.70. They are included in "(A) Dwelling Unit", as an additional location.

I don't see a greater hazard when the garage is detached from the dwelling unit, IMO.

 

[M. D.]

George it seems to me this structure is different from the dwelling unit.

For dwelling units , attached garages, and , detached garages...

This is a list of things , IMO.

The way 334.10 is worded this type III , IV ,V (I assume) would need the 15 minute finish rating .

 

[M. D.]

Garage is also defined as " A building or portion of a building......

 

[bphgravity]

I agree with M.D.

Open cell and truss design in a Type III, IV, or V construction type requires the cablke to be concealed within the 15 mintue finish.

 

[volt101]

I don't see a greater hazard when the garage is detached from the dwelling unit, IMO.

Me neither

But the code is black and white. (and grey all over)

I think that a code proposal for 2011 is in order.

Jim Grant
Rochester, New Hampshire

 

[George Stolz]

For dwelling units , attached garages, and , detached garages...

This is a list of things , IMO.

It's contained in 210.70(A), not 210.70(C), just to clarify what I was trying to say.

What is necessary to attain a 15-minute finish rating?

 

[Pierre C Belarge]

The 15 minute fire rating is for "other structures". In my opinion, the detached garage on a dwelling premise does not have to comply with 334.10(3), it can comply with 334.10(1) & 334.15.

Of course local standards withstanding.

 

[david]

(1)is single family dwellings (2) Multi family dwellings The code says what it says it does not mention the premises for these structures, it calls out the structures them selves .
On the other hand it is not a stretch to say this is an over site on the language (1) should be single family dwellings and their accessory buildings

 

[volt102]

(1) should be single family dwellings and their accessory buildings

Perfect!!! Write a 2011 proposal...

Jim Grant
Rochester, New Hampshire

 

[bphgravity]

What about multifamily accessory buildings? Where should the line be drawn?