mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Any issue with bus duct carrying critical and equipment power being right next to bus duct carrying normal power? Would separation or a 2 hour fire barrier be required?
Normal and Critical Branch Separation
- Thread starter mbrooke
- Start date
- Status
chrismarcellino
Member
- Location
- Minnesota
- Occupation
- ee
No issue from the NEC. Just must be "entirely independent" with a few exceptions. 517.30(C)(1) and (3) discuss the separation and cable/raceway requirements but there is no special barrier needed by electrical code, though building, site policy etc. may differ. Should be spec'd.
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Thanks.
Any idea if a fault in any busbar will take out the neighboring one?
Any idea if a fault in any busbar will take out the neighboring one?
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Here are some more examples:
They are literally feet to inches away from each other, horizontally grouped in the basement for the life safety, critical and equipment branches; vertically piercing each floor diaphragm for the critical, equipment and normal power despite each panel, transformer, ect being in its own electrical room (essential vs normal) with 2 hour fire barriers in between. Life safety is encased in concrete as it transitions vertically FWIW.
They are literally feet to inches away from each other, horizontally grouped in the basement for the life safety, critical and equipment branches; vertically piercing each floor diaphragm for the critical, equipment and normal power despite each panel, transformer, ect being in its own electrical room (essential vs normal) with 2 hour fire barriers in between. Life safety is encased in concrete as it transitions vertically FWIW.
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