Amps Posted August 4, 2008 Share Posted August 4, 2008 Is the only difference that Grade 3 contacts have the resistore all ready fitted ? Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/ Share on other sites More sharing options...
james.wilson Posted August 4, 2008 Share Posted August 4, 2008 Nope, resistors are irrelevant for grading. A grade 3 contact must among other thing either detect the presence of an external magnetic force that could bypass it, or be immune from it. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206401 Share on other sites More sharing options...
Amps Posted August 4, 2008 Author Share Posted August 4, 2008 Thanks redbull. So whats a grade 2 contact? Where can i find what is neede for grade 2/3 systems? everyone i speak to seems to have different ideas Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206402 Share on other sites More sharing options...
james.wilson Posted August 4, 2008 Share Posted August 4, 2008 very similar to the old BS4737 ones, but with tamper detection using a tamper switch complaint with the std. ie not the 2 metal tabs the old jb's had. They are Grade 1 now securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206403 Share on other sites More sharing options...
Amps Posted August 4, 2008 Author Share Posted August 4, 2008 very similar to the old BS4737 ones, but with tamper detection using a tamper switch complaint with the std. ie not the 2 metal tabs the old jb's had. They are Grade 1 now The grade 3 contacts i have been fitting still have the 2 metal tabs for the tamper! Castle care-tec with resistors pre fitted. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206406 Share on other sites More sharing options...
james.wilson Posted August 4, 2008 Share Posted August 4, 2008 they are old Grade 3 ones then, from before the reg change, cqr by any chance? securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206408 Share on other sites More sharing options...
Guest anguscanplay Posted August 4, 2008 Share Posted August 4, 2008 very similar to the old BS4737 ones, but with tamper detection using a tamper switch complaint with the std. ie not the 2 metal tabs the old jb's had. They are Grade 1 now but not juntion boxes Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206410 Share on other sites More sharing options...
james.wilson Posted August 4, 2008 Share Posted August 4, 2008 yep jb's too. Its to do with the enviroment class and that tabs corrode etc securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206411 Share on other sites More sharing options...
Guest anguscanplay Posted August 4, 2008 Share Posted August 4, 2008 yep jb's too. Its to do with the enviroment class and that tabs corrode etc section 9 says "....but is optional in grade 1 and grade 2" though I was thinking about this today - why dont we have to tamper the BT block? Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206414 Share on other sites More sharing options...
james.wilson Posted August 4, 2008 Share Posted August 4, 2008 But i thought we were discussing G3? But re tampering of BT joint, where would you stop? As a tool is required to disconnect the block it isnt tampered, if the line was disconneted at the block, to dp, the pole etc the panel will report a line fault. Same with IP as long as a tool is required then its ok, what you cant do is use a std cat 5 socket and patch lead as no tool is req to disconnect. There is a whole guide on signalling connection location etc coming from the BSIA. Ie no comms in entry routes etc But again this is all only G3, G2 as a low to medium risk can just be plugged in which is why IMO G2 will over the next few years be accepted less and less. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/24285-difference-between-grade2grade-3-door-contacts/#findComment-206416 Share on other sites More sharing options...
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