hey fellas , just a quickie , pricing for a job where the landlady wants smoke alarms putting in 5 existing pre 1990 properties . She wants each detector wired off that rooms light , not a problem as long as 300m away and that complies with building regs as grade D , catagory LD2 system . The issue im not sure about is if the existing lighting circuits are not rcd protected then am i required to include this or because its classed as an addition to an existing circuit im ok , until the kitchen gets involved then it becomes a special location and thats a different story , yes . If its non notifiable then do i need to up grade main earth and bonding or can i get away without needing too , thanks .
grade d , cat LD2 smoke alarm system
- Thread starter wsoppitt
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As the cables will not be burried in a wall at <50mm then they won't need to be RCD protected (unless it's a TT that is
)
If you are adding to a circuit within a special location as defined by part p then it is notifyable.
If the earth and bonds are not up to scratch then they will need to be upgraded
How are you going to interlink them?
)If you are adding to a circuit within a special location as defined by part p then it is notifyable.
If the earth and bonds are not up to scratch then they will need to be upgraded
How are you going to interlink them?
Manator
©Honorary Essex Boy™
Ok I am going to let everyone in on a secret. BS7671 is not a sat
ute law, its a guidance. Admmitted one that can get you out of trouble if followed to the letter, but ,and this is a big but, you are permitted to install anything that does not in any way reduce the effective protection and safety that a fully compliant as per regs would acheive.
This would mean that you firstly have to do a risk assessment, then consider the requirements, and based on your findings design a circuit that as a designer you could justify.
If we now read the regulation requirements, I find no definition in the requirements for any alarm sytem to be RCD protected, unless we consider cables intalled within walls less than 50mm, and not under the supervision of any trained person.
Having said all of the above, as the designer you almost have a free reign on what you install, providing that it is safe.
ute law, its a guidance. Admmitted one that can get you out of trouble if followed to the letter, but ,and this is a big but, you are permitted to install anything that does not in any way reduce the effective protection and safety that a fully compliant as per regs would acheive.
This would mean that you firstly have to do a risk assessment, then consider the requirements, and based on your findings design a circuit that as a designer you could justify.
If we now read the regulation requirements, I find no definition in the requirements for any alarm sytem to be RCD protected, unless we consider cables intalled within walls less than 50mm, and not under the supervision of any trained person.
Having said all of the above, as the designer you almost have a free reign on what you install, providing that it is safe.
Wasnt planning on interlinking alarms as its not a new installation and was wired pre 1990 . Have given the client the option as would prefer to interlink but due to finances the client probably wont want it . Have given the option of using radio signalled smoke alarms but again price of those are a main factor . Not a requirement of smokes to be interlinked under building regs so all dependant on what shes willing to spend . With regards to heat detector off the light circuit this would require rcd protection surely due to switch wires of circuit under 50mm depth ?
But I'm guessing you didn't install the switch drops,,,, so no RCD required
Hang on a mo..........
How can a property with a pile of stand-alone smoke detectors be classified as an LD2?
The BS in question doesn`t rely on 7671 or building regs; 5839-6 supplies domestic classifications.
And the way I just read it, something is going to be wrong.
if you`re going to issue a 5839 cert for the alarms (?), I`d be interested to see how you fill it in, and show compliance with an LD2 specification.
reference: BS5839-6 clause 13.2 c) & e)
KME
How can a property with a pile of stand-alone smoke detectors be classified as an LD2?
The BS in question doesn`t rely on 7671 or building regs; 5839-6 supplies domestic classifications.
And the way I just read it, something is going to be wrong.
if you`re going to issue a 5839 cert for the alarms (?), I`d be interested to see how you fill it in, and show compliance with an LD2 specification.
reference: BS5839-6 clause 13.2 c) & e)
KME
Your right , i just read what i posted , omit the part about LD2 as its not going to be a fire alarm system just individual smoke alarms , my mistake .
---------- Post Auto-Merged at 19:01 ---------- Previous post was made at 18:55 ----------
If you ignore the part about a LD2 fire system , does building control require individual smokes to be interlinked if in an existing installation ?
---------- Post Auto-Merged at 19:01 ---------- Previous post was made at 18:55 ----------
If you ignore the part about a LD2 fire system , does building control require individual smokes to be interlinked if in an existing installation ?
You need to have a read of Part B of the building regs Pages 17 & 18
Personally I wouldn't install multiple alarms which aren't linked,,, if anything were to happen and people didn't hear an alarm then it'd be you in the dock
Personally I wouldn't install multiple alarms which aren't linked,,, if anything were to happen and people didn't hear an alarm then it'd be you in the dock
Concur big-time with the Nozzer. Check with part B.
KME
KME
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