Class E Circuits

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Alwayslearningelec

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NJ
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Estimator
In a Class "E" addressable system what devices(indicating/notification) require separate circuits. I know the with a speaker/strobe you have separate wiring for the speaker and strobe and then a/b alternating circuits. But as far as pull stations strobes etc. which can go on the same "loop" circuit? Just curious
 
horsegoer said:
In a Class "E" addressable system what devices(indicating/notification) require separate circuits. I know the with a speaker/strobe you have separate wiring for the speaker and strobe and then a/b alternating circuits. But as far as pull stations strobes etc. which can go on the same "loop" circuit? Just curious
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what the hell is a class E circuit, never heard of it. Style E, yes, but in the 2010 nfpa 72 went back to just class A and B.

If, you are talking about mixing a NAC and and SLC in the same cable, yea thats OK, unless the manufacturer or AHJ says no.
 
ron said:
I'm guessing he is talking about a high rise base building fire alarm system in NYC.

The drawings required by the FDNY will dictate the circuiting.
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Looking at the riser it does not indicate wire sizes but as far as 4 pair #16, 4 pair #18 for devices I'm ok. It show different/separate circuits for the speaker/strobes,strobes, then separate for pull station then separate for warden stations. I was not sure if that represented how they actually wanted it wired? They don't shoe wire sizes which they usually do so that's why I'm questioning this.
 
horsegoer said:
Looking at the riser it does not indicate wire sizes but as far as 4 pair #16, 4 pair #18 for devices I'm ok. It show different/separate circuits for the speaker/strobes,strobes, then separate for pull station then separate for warden stations. I was not sure if that represented how they actually wanted it wired? They don't shoe wire sizes which they usually do so that's why I'm questioning this.
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It sounds like someone stuck you with a generic riser diagram for the system. Typically they'll show smokes, heats, pulls, strobes, speaker/strobes and horn/strobes as if each type of device is home-run to the panel; all smokes on one line, all heats on another, etc. This is the height of laziness. The exception might be if someone is doing voice-evac with a conventional panel, but I don't think that is likely. Communication (voice or A/V), phones, and alarm devices (including monitoring and relay modules) will all have separate circuits. The important things will be whether anything is wired Class A and where CI cable is required, if at all.
 
gadfly56 said:
It sounds like someone stuck you with a generic riser diagram for the system. Typically they'll show smokes, heats, pulls, strobes, speaker/strobes and horn/strobes as if each type of device is home-run to the panel; all smokes on one line, all heats on another, etc. This is the height of laziness. The exception might be if someone is doing voice-evac with a conventional panel, but I don't think that is likely. Communication (voice or A/V), phones, and alarm devices (including monitoring and relay modules) will all have separate circuits. The important things will be whether anything is wired Class A and where CI cable is required, if at all.
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Thanks Gadfly. What do you mean by CI cable. Communication Interface???? They want us to run network cable to tie the DGP's etc
 
horsegoer said:
Thanks Gadfly. What do you mean by CI cable. Communication Interface???? They want us to run network cable to tie the DGP's etc
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Circuit Integrity. Designed to survive 2 hours in a raging inferno, get smacked with a stream from a fire hose, and still carry current. Used in any situation where you are doing other that total evacuation at the first alarm; defend-in-place, floor above floor below floor of incidence, or areas of refuge, to name a few. It's mighty pricey, but you usually use it for risers only, or if you network the voice/notification components.
 
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