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Andyha last won the day on September 17

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  1. Ceiska I am going to add some answers to your post but I agree with others that there is really too much detail here. Question - what is your motivation for seeking this information. Do you want to get into security, are you just curious or are you an aspiring burglar Whatever the reason while I can see your are interested you need to get a job in the industry. This is a practical industry: you need to install this stuff for much of this information to mean anything. There are a myriad of options and alternatives and many different ways of achieving the same outcome all o
  2. I think we would have to agree to disagree Note also that the basis of this thread is to help the original poster. All I am saying is "do be careful" So you may be right that it is "not true" under certain circumstances, with certain insurers and with certain polices, however the time to find out I am right is not after a claim is refused So I repeat: "do be careful"
  3. Good point well made on 6A/H battery and caution Must admit I had not done the load to amp/hour calculation while writing that post Hopefully useful to the original post and yes, far to many will run a 1A PSU at 950mA load or more cos it can so it must be right
  4. There was, I think, a bit of an issue with COTs G4 panels being self assessed at G4 as opposed to being independently tested. There was also an issue with detectors which have to be mapped to the panel at G4 I believe, so a detector from manufacturer A would not work with manufacturer B's alarm panel because of the encrypted protocol exchange between the two. It's interesting that some believe G3 is OTT and inappropriately specified by architects and engineers alike - heaven help us all if G4 became the base standard for all those who just pick the highest number from the standard be
  5. No offence taken But Not a comment of a great deal of assistance to the original poster It is a well documented issue - Thank you PeterJames for your post Speak to the ABI for more examples and for their general advise to their members on what constitutes "using all means available" It is a fact that if you leave a window open or unlocked or fail to lock your doors it is seen as thus and may affect any payout. I agree though that it is both policy specific and subject to the claim details and insurance claim assessors due diligence in asking a
  6. Agreed the capacity of the PSU must be adequate to support quiescent current and recharge of battery at the same time. Thus I specify PSU load to be not greater than 50% PSU capacity. What seems like a simple question has quite a complex set of answers
  7. Interesting The quiescent current of the system is the load off the battery when there is no mains power noting that in systems with multiple distributed PSU's the load is in fact taken for each PSU (it is not aggregated) The alarm load is similarly taken for each PSU with the alarm activated (i.e. sounders and strobes, any relays and other alarm loads being driven I don't believe the recharge load to the battery, while very important, counts in this calculation The calculation is for establishing the simple battery autonomy. For each battery you take the quiescent current
  8. Some wise words going on here Most (probably all) insurers that require an alarm to be fitted as a condition of insurance mandate the use of an NSI or SSAIB accredited installer and that it has a maintenance contract (and that it is serviced at a frequency in accordance with the requirements for the system type). I doubt any accredited installer would be happy to install the alarm and certify it without having a maintenance contract and not just because of the revenue stream associated with said maintenance contract. Some may but will caveat their quote against any liability if the alarm
  9. There are no grade 4 IAS panels on the commercial off the shelf market in the UK. Grade 4 is only available to Government/Military who need an additional level of security. There are very few (like 2) grade 4 detectors - also not available as COTs Assume it is for signalling only or ask for a Threat and Risk Assessment that informs a G4 solution.
  10. Bit late to contribute but to add to this: I agree with what PeterJames has written. In addition in larger and integrated systems there is an additional step of "setting to work" In high security environments commissioning include empty building full set and each detector is activated. This needs considerable planning and some engineering interventions to avoid multiple activations as the tester moves around the protected areas to activate detection, especially perimeter line detection. It also needs the special simulation detection for equipment like acoustic glass break detection
  11. Why would you need to upgrade just because of a couple of false activations (in fact activations for no known reason)?

     A couple of false alarms from one sensor in a short time period could indicate a developing problem. Change the sensor their cheap enough (and easy enough to do). If on separate sensors then this might just be statistically random event.

    If you are looking at upgrading for different reasons (enhanced features etc) then identify the features your require (such as remote access) and find the product that provides these features. Provided it is a Graded product (suggest Grade 2 minimum) it is "good". Best is too subjective as some engineers favour one panel as best over other panels.

    Don't forget to upgrade detectors as well - these are the source devices and the cause of most false alarms if not correctly selected or positioned  

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