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Author Topic: Running 18/2 to power panels and sirens - length and gauge question!  (Read 2858 times)

Ryan Boder

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #15 on: May 15, 2013, 10:00:44 AM »
It says 18awg for up to 100ft which is a 2.17V drop with 1700mA. You would have the same drop at about 39ft with 22awg so 22/2 should be fine for up to 39ft.
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rive

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #16 on: May 15, 2013, 10:23:40 AM »
It says 18awg for up to 100ft which is a 2.17V drop with 1700mA. You would have the same drop at about 39ft with 22awg so 22/2 should be fine for up to 39ft.

The OP needs to run 18/2 unshielded, not 22/2 as his runs exceed 40'

The runs will be from 25 to 40 or 45 feet. 

agoldenbee

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #17 on: May 15, 2013, 10:38:20 AM »
I'd hope they know their product but also, as I said, the people seemed "young".  The first guy told me running 22/2 should work.  Maybe if I ran it 3 feet.

It's common to power the 2GIG panel with 22/2 over longer distances than 3ft. You might as well use 18/2 if you are running a new cable but I've seen many installations that used existing 22awg keypad wire to power the panel and they work fine at distances around 20-30ft. Even further if you use all 4 conductors of the 22/4 keypad cable and double them up. I've also seen a 2GIG panel run on 12V. I know one DIYer off the top of my head that powers his 2GIG panel with the 12V aux power from his previous panel and it's been working fine for 2+ years, though I do not recommend doing that! I don't know what the minimum voltage is but I guess probably around 12V.

Thanks - it helps to know that there is some flexibility.

In the end of the day, this has nothing to do with 2Gig as much as it does with the laws of voltage loss over length and gauge.

The problem is I can't find what the minimum voltage/amps the panel(s) require.

But it's clear from your example, I should be more than fine.   I'll have two piezo external sirens powered by the main panel but those don't draw too much so I should be fine.

As I mentioned, I'll be testing this all out by cutting out 40 foot lengths for each panel and siren, connecting it all in their respective locations on the floor, and testing connectivity before drilling and running wires.

Thanks again!

rive

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #18 on: May 15, 2013, 10:42:41 AM »
Do not use 22/2 for you 40' + lengths. You will have issues.

Just go with 18/2 and make it easy. As long as the runs are less than 100' you will have no issues whatsoever.
« Last Edit: May 15, 2013, 10:47:17 AM by rive »

agoldenbee

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #19 on: May 15, 2013, 10:44:35 AM »
Do not use 22/2 for you 40'l+ lengths. You will have issues.

Just go with 22/2 and make it easy


I am - mostly because 18/2 is more a generic wire gauge I can keep around for many uses in the future.

Greybar has General Cable (Carol Brand) which I've used for other low voltage stuff and like their product.  1000 feet of riser, unshielded in a pull pack is $121.00.

Obviously I don't need that much but it's a decent price so I'll keep it around for other stuff as needed.

rive

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #20 on: May 15, 2013, 10:46:13 AM »
That's a good price (oops typo)

I meant go with 18/2 unshielded

Also, whatever the run is, add another 3-5' for play
« Last Edit: May 15, 2013, 10:50:04 AM by rive »

Ryan Boder

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #21 on: May 15, 2013, 11:03:18 AM »
I just mean that you can use 22/2 for longer than 3ft like agoldenbee wrote jokingly. I didn't mean to confuse anyone.
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Ea3Ltd

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Re: Running 18/2 to power panels and sirens - length and gauge question!
« Reply #22 on: May 16, 2013, 09:15:53 PM »
I have yet to hear a Loud 2Gig!!!

If you want a attic siren that is loud say 120db  you have to use a separate power supply and a relay!

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