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ive been told its 2. it is 2 outlets.
Does that mean you count a twin fluorescent as 2 because it has two tubes?
Discuss some random questions about testing... in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
ive been told its 2. it is 2 outlets.
Originally Posted by Aaron123
Hi guys,
I've got alot of questions that i'd like to be answered.
1) Is a double socket counted as 1 point served or 2?I dont have the info to hand but it always used to be "each outlet counts as one point"...so a double would be two,this was for the pupose of establishing that the number of spurs does not exceed the number of outlets on the ring.....but for the puposes of a schedule of circuit details each point counts as 1...double or single.
I count it as one, and have read somewhere on here that its one, but a few people in work are adamant that its classed as 2. Is there any hard evidence that its classed as one that i can show them? What is the reason for number of points served?
Light switches? Are they counted?I count the number of loaded points...ie with a lamp...ignore switches.
PIR's? are they counted?As above
Spurs - do you count them or what they are feeding? or both?The spur point only
Isolator - do you count them or what they are isolating? or both?Isolator only...one point
Is there any documentation on number of points served? as it seems to be quite a few people including myself are unsure about it.Not that I am aware of...I've been doing as above for years without any comeback
2) PFC
Scenario: Lets say there is a pfc of 25KA at the mains which is protected by bs-88's, thats fine right. But then I have a pfc at a DB in that installation of 19ka, it is covered by 60898 breakers (10ka rating) I know these breakers would not be sufficient for the KA, but if that kind of fault current was flowing that the 60898 breakers could not operate the bs-88's at the mains would operate and cover the DB, so would that be a valid arguement that the board is covered?
Am I making any sense?
Outside Lights - they dont have to be covered by an rcd right? if they are out of reach fair enough, but what if it is low level surely it should be covered? it says in the regs that all mobile equipment for use outdoors is to be covered by an rcd, so spurs do not have to?In non special location situations on TN systems there is no requirement to provide rcd protection to fixed equipment outdoors..411.3.3
Periodic inspection:
Lets say the installation your testing does not conform to the 17th edition,
For instance if you have sockets that are not covered by an rcd, what do you do? does this mean it fails? Do you right it down as a recommendation? Or is it acceptable, because im guessing it conformed to the regs at one point...If that socket was liable to supply equipment outdoors or in another hazardous situation that would warrent a code 2....if it was not liable to supply equipment outdoors code 4.
No cpc on circuits, just trunking and conduit as an earth, is this ok? does it fail? do you right it down as a recommendation, because again at one point this conformed with the regs.As long as tests were satisfactory and the system was sound a code 4 might be appropriate
No rcd on circuits in bathrooms/swimming pools etc, is this ok? does it fail? do you right it down as a recommendation....bathrooms are only a recent requirement to rcd,you cant condemn all installs prior to 2008,so a code 4...swimming pool more serious as rcd protection has been a requirement for equipment in the zones for a long time,code 2 or even 1
This guy in work said that having live parts showing in the board (old c50 type) was a fault and he gave it a code 2? I said to him, its a board, it's meant to? Is he right? Surely not?As long as the live parts can only be accessed with a tool and the board was labelled "exposed live parts within" no code...if the live parts can be accessed without a tool code 2 or even 1 if in a situation where accessible to unskilled/unsupervised persons
Do sockets have to have a flying earth lead to the back box? I always do it, would you right it down as a fault on a new installation?As long as the socket has earthed metal screwholes and the box has at least 1 fixed lug...no......if there is no separate cpc(conduit earth)...yes.
Ceiling grid, does it have to be bonded? the lights that sit in it are earthed, would this be sufficient? No..it is unlikely to be an extraneous conductive part...see the definition of an extraneous conductive part in the BRB
I know its a lot of questions, but i would be grateful if anyone can answer them.
Cheers,
Aaron
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agreed i may be wrong but i think, i cant find the paperwork, the niceic say its 2 points of utilazation ,spelling, on a circuit.
When I sat my 2391 in 2000, I was taught by the head of technical at my local college. I asked the question, how many points is a double socket classed as, the answer was one point of utillization.
On the subject of ferrous enclosure being used as a protective conductor, the inspection and testing is a bit more involved than just using an ohm meter. Does an ohm meter prove the joints are capable of carrying a fault current? Should you inspect the enclosure along its length to verify its integrity?
At the end of the day, courses like the 2391 are there for a reason, more people need to sit and pass them.
Reply to some random questions about testing... in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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