Mrg12000 Posted September 8, 2007 Share Posted September 8, 2007 Hi, I am doing a spec which will require expanders? It will be grade 2 but i am not sure do i have to fit a psu to comply to the standards? I am sure you have to for grade 3 but no sure for grade 2? I am also connecting smoke detectors to this system is there anything like breakglasses which i can connect to this sysem? Any info much appreciated. mrg Link to comment Share on other sites More sharing options...
Guest Dave the alarm man Posted September 8, 2007 Share Posted September 8, 2007 Hi,I am doing a spec which will require expanders? It will be grade 2 but i am not sure do i have to fit a psu to comply to the standards? I am sure you have to for grade 3 but no sure for grade 2? I am also connecting smoke detectors to this system is there anything like breakglasses which i can connect to this sysem? Any info much appreciated. mrg system is graded to the grade (or lack off) of the lowest graded item on the system a normal MCP can be put on a system BUT fire bits on an intruder are nowhere the same thing as a proper fire alarm Link to comment Share on other sites More sharing options...
Mrg12000 Posted September 8, 2007 Author Share Posted September 8, 2007 What i meant was for every expander do you have to fit a PSU? Thanks Link to comment Share on other sites More sharing options...
Guest Dave the alarm man Posted September 8, 2007 Share Posted September 8, 2007 depends , design based on volts drop, loading (standby & alarm) & size of battery fitted to psu Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted September 8, 2007 Share Posted September 8, 2007 dont believe its a specific part of the grading as long as your within the limits for the panel Link to comment Share on other sites More sharing options...
arfur mo Posted September 8, 2007 Share Posted September 8, 2007 for any system even G1 you need to know what the panel can supply as 'spare' current, the current draw of attached equipment like pits, dualtecs and also the cable distance's for voltage drop issues, you also need to add in the consumption of the expanders. do all that and then add at least 30% margin to allow for batteries to recharge after a substantial power fail. for G3 i think you need 'intellegent' psu's i.e. ones monitored by the main panel regs alan If you think education is difficult, try being stupid!!!! Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted September 8, 2007 Share Posted September 8, 2007 thers a new way of calculating max power available but I`m dammed if I can remember it - trip to car later Link to comment Share on other sites More sharing options...
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