Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Suggested Answer
  • Replies 14 replies
  • Helpful Answers 1 Helpful answer
  • Subscribers 40 subscribers
  • Views 1872 views
  • Users 0 members are here
Options
You may also be interested in

what JB/enclosure required for fire alarm installation

Tom D

I am not an expert but re fire alarm systems but I need to split my fire loop due to modular project requires that.

Once the whole project delivered on site everything will be connected back and stays for years.

I have come across conflicting opinions about this.

Some say that this has to be done by using fire resistant plastic JB with ceramic terminals whereas other says that it need to be steel box not plastic.

I have fount both of them plastic and SS JB and they both actually "fire resistant" so I am confused completely.

 

Parents
  • 0

    I was also told that when I use any steel box I don't need to select ceramic terminals for FP200 connection but if it's plastic enclosure ceramic are mandatory. Is that correct?

  • 0 in reply to Tom D

    No Its not. the material that the box is made from doesn't matter only that the joints are fire resistant to the same rating of the cable. the box can be any colour but it must be labelled fire alarm

  • 0 in reply to Will Lloyd

    Thanks for your answer Will.

    How do I know in the standard cable terminals I use (Wieland) are rated to the same level as FP200 cable is?

  • 0 in reply to Tom D

    To be the same rating as the cable the joint would need to be ceramic I’m not personally familiar with eth Wieland range so if they are plastic then the answer they are not

  • 0 in reply to Will Lloyd

    To be the same rating as the cable the joint would need to be ceramic

    Not my area, so just out of curiosity... I can follow that logic for say the old mineral insulated cables (pyro etc.) but FP is basically a plastic insulated cable (with an aluminium screen) - pretty special plastic perhaps, but still plastic. If the terminals housings were made of the same (or better) plastic, wouldn't that do?

       - Andy.

  • 0 in reply to AJJewsbury

    Fire resistant cable (FP) is tested to annex E of BS EN 50200 this standard includes different classifications based on the cable's ability to maintain circuit integrity under fire conditions, with classifications such as PH15, PH30, PH60, PH90, and PH120 indicating survival times in minutes. Annex E introduces The "CWZ" designation which refers to a specific test sequence within BS EN 50200 that includes a direct flame application, mechanical shock, and, a water spray, to simulate fire and its associated hazards. 

    • Flame Test:

    Cables are subjected to a direct flame at a specified temperature (e.g., 830°C). 

    • Mechanical Shock:

    A steel bar strikes the cable or its mounting backboard at regular intervals. 

    • Water Spray:

    Annex E of BS EN 50200, included in the CWZ test, introduces a water spray component. 

    While FP 200 is a soft skin cable it’s not plastic, as it needs to survive 830 degrees C. so the short question is can your connectors survive 830 degrees C? if they are plastic I’m guessing the answer is no.

Reply
  • 0 in reply to AJJewsbury

    Fire resistant cable (FP) is tested to annex E of BS EN 50200 this standard includes different classifications based on the cable's ability to maintain circuit integrity under fire conditions, with classifications such as PH15, PH30, PH60, PH90, and PH120 indicating survival times in minutes. Annex E introduces The "CWZ" designation which refers to a specific test sequence within BS EN 50200 that includes a direct flame application, mechanical shock, and, a water spray, to simulate fire and its associated hazards. 

    • Flame Test:

    Cables are subjected to a direct flame at a specified temperature (e.g., 830°C). 

    • Mechanical Shock:

    A steel bar strikes the cable or its mounting backboard at regular intervals. 

    • Water Spray:

    Annex E of BS EN 50200, included in the CWZ test, introduces a water spray component. 

    While FP 200 is a soft skin cable it’s not plastic, as it needs to survive 830 degrees C. so the short question is can your connectors survive 830 degrees C? if they are plastic I’m guessing the answer is no.

Children
No Data

Community Rules & Guidelines