alarm system grade and category

Discuss alarm system grade and category in the Security Alarms, Door Entry and CCTV (Public) area at ElectriciansForums.net

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gpz900jim

hi. have installed a pair of mains powered smoke alarms, with battery back up. they are linked so that they will both go off together.They are in a house. It states on my EWC that I need to issue a certificate for these, I have got the certs but am unsure of their classification. Are they System grade B,C,D,E,or F . and also are they System category LD1 LD2 LD3 PD1 or PD2 ? Also on the certificate it asks for the sound lavel test instrument model and serial number. Is it nessessary to test the sound output level on something like this? Cheers,
 

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