everynights a 17th edition night

[i=p/u]

ask me questions, see if i can find in appropiate time, no trick ones please only if you have nothing better to do..

 

[Sparky Ninja]

i thought multiply by 1.6 , as 20 degrees isnt in red book i guestimated 1.6 using the sequence..... so does this be done in the real world???? ive seen in some thread that you multiply by 1.2 is that figure normal used for safe side???


so much to consoder i bettter get 20 an hour when im finished this course lol

The factors will vary according to what the initial 'control' temperature is.

For example, here they start at 10 degrees, so 10 degrees = 1. Whilst in the resistivity of conductors (OSG page 167) they start from 20 degrees, so 20 degrees = 1.

 

[i=p/u]

i thought 30 degrees = 1 but am i on about current carring capacity

 

[Sparky Ninja]

i thought 30 degrees = 1 but am i on about current carring capacity

again.. that is correct as the ambient temperatures in BS7671 appendix 4 are based on the ambient temperature of 30 degrees.

As you can see, one of the most important things to first work out is what the initial temperature is based on.

 

[Traineenoob]

At a marina on a floating walkway or pontoon what height can you install a socket outlet?

 

[i=p/u]

i know when designing Iz greater or eual than In greater than equal than Ib, this is all divided by your 4 factors, you then have your cable and protective device selected, then you do your volt drop too see if is ok,

but how do you know your zs will be within limits......??? do you take off your Ze and the remainder is divided by table 9A osg to give you your distance...... and i know table 7.1 osg gives you all this..

 

[telectrix]

At a marina on a floating walkway or pontoon what height can you install a socket outlet?

at high tide or low tide, that is the question.

 

[GLENNSPARK]

Minimum CSAs for flexes and cables for caravan connections I=P/U.......table and page no. please.......

 

[Marnik]

I'm a little confused here;I've read this thread which was started by i=p/u , who i wholeheartedly respect on this forum, however what i can not fathom is this; are you doing a course on what i understand to be BS 7671 ? or are you doing the C&G 2391 ?
The reason i ask is, if you are doing 17th edition BS 7671, then this exam is open book, multiple question {(which means, an exam to show that you can read a book and find relevant answers to questions quickly in said book),The BRB soon to be The BGB}, where you should PASS with no less than 99% in your case. If however i read it at wrong, and you do indeed are doing the 2391, then pm me, as i have loads of help at your disposal.
Marnik

 

[i=p/u]

1= reg 114.1
2= annex A the awnser lys but all i can say doesnt mention rechargable or not
3= part 2 defintions
4= starting and stoping reg 552.1.1
5= part definations noral service
6= luminaires marked D reg 422.3.2
7= cable cleat part 2 definations
8= reg 414.2
9= reg 432.1
10=

1) BS7617 is a non-statutory document, but if it is adhered to, compliance with which statutory document is likely to be achieved?
2) When may non-rechargeable auxiliary batteries be used in caravans?
3) With a DC voltage of 125V between conductors how would the installation be classified?
4) What is the most likely cause of an overload current arising in an electric motor circuit?
5) Under what conditions is the design current of a circuit defined?
6) Name a type of lighting equipment likely to require additional protection against thermal effects?
7) A component of a support system consisting of regularly spaced elements which mechanically retain a cable is defined as?
8) Name 3 SELV sources that will provide combined basic and fault protection?
9) A protective device giving protection to both overload and short circuit must be capable of breaking current up to what level?
10) A 230V single-phase heating circuit has a design current of 25A. The length of the PVC insulated cable is 20m. The 4mm[SUP]2[/SUP] cable installed has a volt-drop of 11mV/A/m. The voltage drop under full load conditions is? And does this comply with BS7671?

11x25x20/1000= 5.5v so complies but do i need todo anything for full load markie sparkie ... or anyone if you out there cheers markie sparkie you can mark now

 

[i=p/u]

winkle picking

at high tide or low tide, that is the question.

 

[scotsparky]

what is secondary insulation

 

[i=p/u]

yes i signed up for 17th edition even tho im learning to 17th edition (level 3 at present) and i have never looked at bs 7671, its getting easier already ty.. as for 2391 i have the enrolment form infront of me, but my lady friend on about going back to work so now il have kids myself in evenings, hope they dont take her back, you hope too.lol oj. not,oj,not ahhhhh

I'm a little confused here;I've read this thread which was started by i=p/u , who i wholeheartedly respect on this forum, however what i can not fathom is this; are you doing a course on what i understand to be BS 7671 ? or are you doing the C&G 2391 ?
The reason i ask is, if you are doing 17th edition BS 7671, then this exam is open book, multiple question {(which means, an exam to show that you can read a book and find relevant answers to questions quickly in said book),The BRB soon to be The BGB}, where you should PASS with no less than 99% in your case. If however i read it at wrong, and you do indeed are doing the 2391, then pm me, as i have loads of help at your disposal.
Marnik

 

[i=p/u]

table 721 page 213

Minimum CSAs for flexes and cables for caravan connections I=P/U.......table and page no. please.......

 

[telectrix]

get tourself on the 2391 as soon as you've got the 2382 under your belt. as for your good lady going back to work, you can always employ a cook. (LOL. and no offence meant.)

 

[Marnik]

do the 2391 as soon as poss. as the are about to change it. also while all regs are fresh in the memory, it should make it easier.
BTW the offer of help still stands!