DavidCR
Mechanical
- Jan 10, 2002
- 359
Blessings, and a hello to everybody.
I've seen in wiring manuals, and cabling guides, from fire alarm panels of main manufacturers (Notifier for example) that SLC fire cable for inteligent panels should not be shielded, and if shielded, the shield shall be broken or isolated from devices ground.
Does somebody know why?
In my case, my only concern is that I'm afraid the cable may pass near a normal power wire. Is there a real negative effect from a motor 120-240AC wire on the SLC for example?
I've asked..., some say the cable lenght may be reduced a little by impedance, others say to use shielded if possible, but i'm not happy with the explanations.
I've also read that the only shielded cable recomended is for voice cable from amplifiers to speakers. is this true?
An explanation or contact with information on the topic will be apprecciated.
I've seen in wiring manuals, and cabling guides, from fire alarm panels of main manufacturers (Notifier for example) that SLC fire cable for inteligent panels should not be shielded, and if shielded, the shield shall be broken or isolated from devices ground.
Does somebody know why?
In my case, my only concern is that I'm afraid the cable may pass near a normal power wire. Is there a real negative effect from a motor 120-240AC wire on the SLC for example?
I've asked..., some say the cable lenght may be reduced a little by impedance, others say to use shielded if possible, but i'm not happy with the explanations.
I've also read that the only shielded cable recomended is for voice cable from amplifiers to speakers. is this true?
An explanation or contact with information on the topic will be apprecciated.