Disconnection times for 30mA RCD at 5 times current.

[volers]

Hi guys ths is my first time on here and relatively new to electrics. I was asked to find the times of disconnection needed for 5x and 1x. I was wondeering if anyone could give me a push in the right direction by pointing out where i could find such useful info inthe BS 7671 or onsite guide. THank you. Volers

 

[ezzzekiel]

look under inspection and testing in either book towards the end of the testing procedures

 

[yellowvanman]

Appendix 3 Page 243 of 17th

 

[Goody]

As per the On-site Guide

- A disconnecting time of not more than 0.4 sec is required for final circuits with a rating not exceeding 32A.
- A disconnecting time of not more than 5.0 sec is required for final circuits exceeding 32A, and distribution circuits.

You have to enter the maximum value of x1 & x5 on your report sheet.

Hope this helps!

 

[volers]

i am looking through bs7671 in the inspection and testing chapter, however I am unable to find the relevant info on disconnection times at different rated currents. Also it keeps referring in the book back to chap. 41. sorry to be a pain and asking such simpleton questions but i want to make it my single mission to get a better understanding of inspection and testing this week!!!

 

[volers]

thanks Goody ii didnt read your post before replying... thats great help. i think my main problem is trying to locate where to extract info from in the holy 7671 book.

 

[Geoffsd]

.......

 

[volers]

As per the On-site Guide

- A disconnecting time of not more than 0.4 sec is required for final circuits with a rating not exceeding 32A.
- A disconnecting time of not more than 5.0 sec is required for final circuits exceeding 32A, and distribution circuits.

You have to enter the maximum value of x1 & x5 on your report sheet.

Hope this helps!

According to the table yellow van man has pointed out... the max trip time for 30 mA at 1x is 300ms.

 

[ExArmy]

at 5 X rcd rating (150mA) the RCD should operate in 40ms

 

[ac/dc]

i am looking through bs7671 in the inspection and testing chapter, however I am unable to find the relevant info on disconnection times at different rated currents. Also it keeps referring in the book back to chap. 41. sorry to be a pain and asking such simpleton questions but i want to make it my single mission to get a better understanding of inspection and testing this week!!!

Hi
When you test a 30 mA RCD you should start at : positiv side - O * (degree)
- 1/2 x I ^n (^ is delta) - (15 mA ) no trip within 2000mS
- 1 x I^n (30 mS) --trip within 200 mS
- 5 x I^n (150 mS) -- trip within 40 mS
repeat hte same at negativ side -180 *
you rec. the highest value ( longest time)

 

[yellowvanman]

@ac/dc
The trip time of 200ms at x1 is for the older RCD types BS4293, for BS EN 61008 trip times are 300ms max.

If you have the old Brown OSG Page 81!

 

[FatBob]

RCBOs / BSEN 61009 trip times are <=300ms

 

[telectrix]

seems to be some confusion over trip times of MCBs and RCDs. RCD times are 300msec.@ x1. 40msec.@ x5. ( TT systems it's 200msec.@ x1. )

 

[FatBob]

17th Apendix 3 page 243. Nice little table at bottom of page.

 

[david.higgins]

All disconnection times are listing in the On-Site Guide page 92. If you are taking your 2330 302/303 make sure you label your On-Site with post-its so you can access the information quicker.