Hi all, I have been working on and installing fire alarms for 10 years now and seem to be finding more and more networked systems being wired on a radial circuit with non isolated network cards. I always beleived systems need to be on a ring circuit with fault monitoring fully isolated cards. Is this not the case as I could be saving a whole lot of money in future.

Regards Mark

Hi all, I have been working on and installing fire alarms for 10 years now and seem to be finding more and more networked systems being wired on a radial circuit with non isolated network cards. I always beleived systems need to be on a ring circuit with fault monitoring fully isolated cards. Is this not the case as I could be saving a whole lot of money in future.

Regards Mark

could they have been old conventional systems quickly upgraded to adressable?

or are you talking new wiring?

can be converted using loop isolators quite well

but yes loop circuits with no spurs

Hi all, I have been working on and installing fire alarms for 10 years now and seem to be finding more and more networked systems being wired on a radial circuit with non isolated network cards. I always beleived systems need to be on a ring circuit with fault monitoring fully isolated cards. Is this not the case as I could be saving a whole lot of money in future.

Regards Mark

Hi Mark

Generally they should be a fault tolerant network wired in a loop. If you have only 2 or 3 panels networked you could probably get away with it.

Pete

Hi Mark

Generally they should be a fault tolerant network wired in a loop. If you have only 2 or 3 panels networked you could probably get away with it.

Pete

i know one site with 12 conventional panels all linked together.what a hash up!

Hi all, I have been working on and installing fire alarms for 10 years now and seem to be finding more and more networked systems being wired on a radial circuit with non isolated network cards. I always beleived systems need to be on a ring circuit with fault monitoring fully isolated cards. Is this not the case as I could be saving a whole lot of money in future.

Regards Mark

I tend to find that if you offer the customer a choice been a radial circuit and a slightly more expensive ring circuit with slightly more expensive network cards, the purse strings will always make the decision. Lesson learned - don't offer them the choice!

If you look at 5839 it shows two options for networked panels - both are in a ring but one is in enhanced if using the same route and the other is in "standard" if it's rout is diversified.

Edited February 20, 201115 yr by CerbNI