18th edition RCD max disconnection times!!

[digital_boy]

Hi all.

I am seeing different figures here all over the net, table3a (p363) states a 30ma RCD has a trip time of 300ms max.

So at 5x is the maximum 60ms? I seem to recall 200ms and 40ms for a 30ma and these are the figures I am seeing over the net...

Please I just want the correct figures for 1x and 5x in a 30ma standard AC rcd

Good morning

 

[stevethesparks]

200ms for the older BS type rcd's (BS4293) and 300ms for the modern/new rcd's (BSEN 61008 61009 & 62423) X5 is still 40ms
On site guide page 118

 

[Ian1981]

If your rcd is for additional protection then only the 5x reading is required on the certificate/report. This does not mean that you don’t have to carry out say the rcd auto test method if that’s what you prefer, but only the higher of the 5x test is required

 

[westward10]

BS4293 devices as Buzz states is an obsolete standard but you will still find them in service, ×1 200ms and ×5 40ms.
Current devices to EN61008 and 61009, ×1 300ms and ×5 40ms.

 

[HappyHippyDad]

BS4293 devices as Buzz states is an obsolete standard but you will still find them in service, ×1 200ms and ×5 40ms.
Current devices to EN61008 and 61009, ×1 300ms and ×5 40ms.

Eh? Where's Buzz?

 

[westward10]

Eh? Where's Buzz?

Oops sorry @stevethesparks

 

[01laverickd]

Hi, I'm just looking for some advice and this seemed the best post to find it.

I haven't got a copy of the regs in front of me so bare with me, please ?

First of all,
TN - 0.4 + 5s disconnection times
TT - 0.2 + 1s disconnection times

Is the above if you were using a BS60898 mcb for fault protection?

If you were using RCD (61008-1) for fault protection (high Ze) :
TT 300ms (0.3s)?

For both TN + TT systems, 40ms if using the RCD for additional protection?

Is this correct?

So on the test, or certainly the older test sheet what goes in the max disconnection time? Is it the max disconnection time for fault current protection and not the additional protection? Which would be 0.4 on the majority of TN systems for most circuits other than distribution circuits (with exceptions) and 0.2 for TT with low enough Ra if not 0.3?

Thanks for your patience reading this ??