TI Improvement for Office & Bus Barn

[Alias]

I had a conversation with a local electrical contractor today about a TI. He has talked to the engineer and was told that changes were okay as long as it meets code. Current plans call for all electrical to be in conduit and in metal boxes.

As I am not an commercial electrical guru, I have questions about what he is proposing. Here are my questions:

1. In concealed spaces, is conduit required? If not, can romex be used?

2. Anybody heard of 4 hr. fiberglass boxes? If so, would you allow their use in a commercial installation?

Office is a B, Bus Barn is a S-2, CA codes.

Sue

 

[Papio Bldg Dept]

as for here, no romex or smurf tube....but boxes might be okay if listed. Conduit or flex for your contractor.

 

[north star]

= = =

Sue,

What type construction is the project?.......Refer to

Article 334.10, in the `08 NEC for the application of

NM wiring assemblies [ i.e. - the Romex brand ].

Also, there WERE 4 hr. listed fiberglass type junction

boxes for rated assemblies type construction.

A manufacturer' rep. came and gave a presentation

of their products to us, but I am currently unable to

pull up their webby site......They **WERE** Allied

Moulded Products, Inc.

As with any products, if you are unsure, ask for

product literature & an example of the actual

product to verify fire ratings.....The fiberglass

elec. boxes that were presented to us had the hour

rating molded in / manufactured in to each type of

rated product.

+ + + +

 

[chris kennedy]

What is a 'Bus Barn'? Class1 Div 2 location?

 

[Gregg Harris]

I had a conversation with a local electrical contractor today about a TI. He has talked to the engineer and was told that changes were okay as long as it meets code. Current plans call for all electrical to be in conduit and in metal boxes.As I am not an commercial electrical guru, I have questions about what he is proposing. Here are my questions:

1. In concealed spaces, is conduit required? If not, can romex be used?

2. Anybody heard of 4 hr. fiberglass boxes? If so, would you allow their use in a commercial installation?

Office is a B, Bus Barn is a S-2, CA codes.

Sue

Sue should it not be S1? Motor vehicle repair garage. 313.3 is S2 and used for storage of non combustible products. S1/B2 would not have any classified areas and NM (Romex) could be used but concealed.

 

[Alias]

Chris -

Think residential garage on steroids. :mrgreen:

The bus barn will be housing vans and small dial-a-ride buses. It is a garage and no repair work will be done on site.

 

[Alias]

Sue should it not be S1? Motor vehicle repair garage. 313.3 is S2 and used for storage of non combustible products. S1/B2 would not have any classified areas and NM (Romex) could be used but concealed.

Gregg -

No repairs on site, only being used for protecting vehicles from the weather.

And thanks, that is what I was thinking that the romex can be concealed behind the new sheetrock. Original business space on the 1st floor will be gutted and reconfigured to accommodate local transportation agency, 2nd floor apartment to remain untouched. Bus barn being converted from U-1 to S-1.

Sue

 

[Alias]

north star -

Thanks. The entire set of plans including electrical appear to have generic 'cut & paste' sections that can be applied to all jobs. Which leads me to another question. Service entrance panel is calling for breakers to be bolted to the bus bar in commercial. Is this a typical install and does anyone have a photo?

Sue

footnote: http://www.alliedmoulded.com/ is the manufacturer of NEMA Type 4x boxes.

= = =Sue,

What type construction is the project?.......Refer to

Article 334.10, in the `08 NEC for the application of

NM wiring assemblies [ i.e. - the Romex brand ].

Also, there WERE 4 hr. listed fiberglass type junction

boxes for rated assemblies type construction.

A manufacturer' rep. came and gave a presentation

of their products to us, but I am currently unable to

pull up their webby site......They **WERE** Allied

Moulded Products, Inc.

As with any products, if you are unsure, ask for

product literature & an example of the actual

product to verify fire ratings.....The fiberglass

elec. boxes that were presented to us had the hour

rating molded in / manufactured in to each type of

rated product.

+ + + +

 

[Gregg Harris]

north star -Thanks. The entire set of plans including electrical appear to have generic 'cut & paste' sections that can be applied to all jobs. Which leads me to another question. Service entrance panel is calling for breakers to be bolted to the bus bar in commercial. Is this a typical install and does anyone have a photo?

Sue

footnote: http://www.alliedmoulded.com/ is the manufacturer of NEMA Type 4x boxes.

Sue there is no NEC code requirement to use bolt on circuit breakers. Instead of having pressure connections to the panel they are held in by bolts.