Class "E" FA..Spkr/Strobes
- Thread starter Alwayslearningelec
- Start date
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mdshunk
Senior Member
- Location
- Right here.
I use those for changing ballasts in HID fixtures. They're the only one's that last without turning to crumbles.
peter d
Senior Member
- Location
- New England
Must be a local rule. It's not an NFPA 72 rule, that's for sure.
Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
So I just want o make sure I have this right. If I have 10 spkr/strobes in area that is calling for "A&B" circuiting. I guess I can wheel of the total footage hitting each device and bring 14/4. that will cover the speaker portion then bring the same footage of 14/4 for the strobe. If I do it with 14/2 to 1,3,5,7, etc. device say 300' then say another 12/2 to 2,4,6,8, devices. Is either way correct?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
You will need a 14/4 for each of the A & B loops. The first 4 wire cable will contain say 1 pair for SPK a and 1 pair for STB A The next device on the B loop will require a 14/4 with 1 pair for SPK B and 1 pair for STB B.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I would only use the type of wire that is specified by the fire alarm vendor. I seen specs that call for shielded and others that say no shielded permitted.
- Location
- Massachusetts
I agree, that is the kind if manufacturer recommendation I would follow to the letter.
The last voice evac system (Siemens) I helped with it was shielded for the strobes and non-shielded for the speakers. :-?:-?:-?
It was a MC job so it was all more or less shielded but we would not be able to get a single cable with one pair 14 AWG shielded and one pair 16 AWG non-shielded.
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