517.13

[electricalist]

The wiring method requires a metal raceway.
Metal sheathed cable assemblies are not permitted for critical or life safety branch circuits.
Reading the specs on HCF MC it says for use in patient care areas.
I know its ok to use when fishing down walls etc. In short where does HCF MC get used the most.

Sent from my GT-N5110 using Tapatalk

 

[roger]

Reading the specs on HCF MC it says for use in patient care areas.
I know its ok to use when fishing down walls etc. In short where does HCF MC get used the most.

It depends on how the specs are written and any VE that may be agreed on so basically it can be used in place of hard piping and is in many installations.

Roger

 

[augie47]

The wiring method requires a metal raceway.
Metal sheathed cable assemblies are not permitted for critical or life safety branch circuits.
Reading the specs on HCF MC it says for use in patient care areas.
I know its ok to use when fishing down walls etc. In short where does HCF MC get used the most.

Sent from my GT-N5110 using Tapatalk

??

 

[roger]

Gus, see 517.30(C)(3)(3), it pretty much eliminates flexible wiring methods for the Critical and Life Safety branches in new construction.

Roger

 

[augie47]

Gus, see 517.30(C)(3)(3), it pretty much eliminates flexible wiring methods for the Critical and Life Safety branches in new construction.

Roger

Am I correct in my thinking that the limitation only applies to then emergency system wiring ?

 

[roger]

Am I correct in my thinking that the limitation only applies to then emergency system wiring ?

Yes.

Roger

 

[electricalist]

Isnt the emergency system made up of critical life safety and equipment circuits?

Sent from my GT-N5110 using Tapatalk

 

[don_resqcapt19]

Gus, see 517.30(C)(3)(3), it pretty much eliminates flexible wiring methods for the Critical and Life Safety branches in new construction.
Roger

Am I correct in my thinking that the limitation only applies to then emergency system wiring ?

Yes.
Roger

I thought that under the 2014 code, only the life safety branch was emergency wiring, or are you just using a generic term?

However that doesn't change the rules in 517 that require non-flexible wiring methods. It does mean that 700.28 does not apply to the critical branch.

 

[roger]

I thought that under the 2014 code, only the life safety branch was emergency wiring, or are you just using a generic term?

However that doesn't change the rules in 517 that require non-flexible wiring methods. It does mean that 700.28 does not apply to the critical branch.

Don, actually under 2014 there is no "Emergency System" which is the reason I said Critical and Life Safety branches in my second post. When I answered "yes" to Gus's question in my third post it was basically a generic answer.

Of course in NC we are still under 11 so many of my answers are still referencing it.

Roger

 

[electricalist]

Essential electrical system, is that the 2014 version of the EES?

Sent from my GT-N5110 using Tapatalk

 

[don_resqcapt19]

Don, actually under 2014 there is no "Emergency System" which is the reason I said Critical and Life Safety branches in my second post. When I answered "yes" to Gus's question in my third post it was basically a generic answer.

Of course in NC we are still under 11 so many of my answers are still referencing it.

Roger

There is no emergency system as such, but 517.26 requires that the life safety branch comply with Article 700, except as modified by Article 517.

 

[roger]

There is no emergency system as such, but 517.26 requires that the life safety branch comply with Article 700, except as modified by Article 517.

Exactly. Nothing has changed from past cycles except doing away with the term "Emergency System".

Roger

 

[don_resqcapt19]

Exactly. Nothing has changed from past cycles except doing away with the term "Emergency System".

Roger

What has really changed is the selective coordination issue. There is a major difference of opinion on that requirement between the technical committees for NFPA 99 and NFPA 70. It is my understanding that difference of opinion was the driving force on the removal of the term "emergency system" from 517.

Coordination (Selective). Localization of an overcurrent condition to restrict outages to the circuit or equipment affected,
accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range
of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective
device opening times associated with those overcurrents.

517.30(G) Coordination. Overcurrent protective devices serving the essential electrical system shall be coordinated for the period of time that a fault’s duration extends beyond 0.1 second.

The first from Article 100 requiring the selective coordination down to time "0" and the second from 517 down to 0.1 seconds.

 

[steve66]

Exactly. Nothing has changed from past cycles except doing away with the term "Emergency System".

Roger

Sometimes that seems really cut and dry.

Other times I don't think I've ever been so confused by a non-change