Emergency Systems

[shaw0486]

In article 700.9 (b) requires that you keep emergency and all other wiring independant, than under 701.10 and 702.9 states emergency wiring is permitted in the same raceway with other general wiring. Which is correct is it permitted to install emergency wiring in the same raceway as normal power.

What does the code mean when is says general wiring?

 

[Buck Parrish]

In article 700.9 (b) requires that you keep emergency and all other wiring independant, than under 701.10 and 702.9 states emergency wiring is permitted in the same raceway with other general wiring. Which is correct is it permitted to install emergency wiring in the same raceway as normal power.

What does the code mean when is says general wiring?

The only places where emergency and normal power is permited in the same location is when you have no other choices. See ecception 1-4

700.9(B) Wiring. Wiring of two or more emergency circuits supplied from the same source shall be permitted in the same raceway, cable, box, or cabinet. Wiring from an emergency source or emergency source distribution overcurrent protection to emergency loads shall be kept entirely independent of all other wiring and equipment, unless otherwise permitted in (1) through (4):

(1)Wiring from the normal power source located in transfer equipment enclosures

(2)Wiring supplied from two sources in exit or emergency luminaires (lighting fixtures)

(3)Wiring from two sources in a common junction box, attached to exit or emergency luminaires (lighting fixtures)

(4)Wiring within a common junction box attached to unit equipment, containing only the branch circuit supplying the unit equipment and the emergency circuit supplied by the unit equipment

IMO General wiring - would be other then emergency - or services

 

[raider1]

Keep in mind that Article 701 deals with legally required standby systems and not emergency systems. Also 702 regulates optional standby, again this is not an emergency system. Emergency systems are regulated by Article 700.

Chris

 

[shaw0486]

701.10 state legally required stand by wiring is permitted in the same raceway with other general wiring. Where does it say only when you have too?

 

[shaw0486]

After reading further into the code i see that emergency system is one more or less installed in a hospital and stand by is for legally required lighting. But the code still staes that you can have them normal , optional and stand by in the same raceway. Does anyone else read this differant?

 

[Buck Parrish]

I was going by 700 - Different system, as Raider said.

So I think You are all right. Any thing other then where it is required would not be considerd an emergency system IMO

 

[raider1]

After reading further into the code i see that emergency system is one more or less installed in a hospital and stand by is for legally required lighting. But the code still staes that you can have them normal , optional and stand by in the same raceway. Does anyone else read this differant?

Actually lighting for means of egress are required to be supplyed by an emergency power source, not a legally require standby source.

The building codes regulate what systems are required. IBC section 2702 gives you the requirements for what building components require what type of backup supply system.

For example 2702.2.5 requires accessible means of egress elevators must be supplied with legally required standby power, and 2702.2.4 requires means of egress illumination to be supplied by an emergency power system.

Chris

 

[shaw0486]

i would use nfpa 101 to see what is required for egress lighting?

 

[raider1]

i would use nfpa 101 to see what is required for egress lighting?

You need to ask your local AHJ what codes are adopted in your area.

Chris