completing test certs

[ambrad]

Hi allsome advice please.i am to add a new low voltage fan to an existing light circuit. On inspection there isnt a bs number on the 6 amp Eaton breaker. this being the case how do i fill in the test cert correctly. Am i allowed to put unknown or is there a way of finding out.also the rcd is a bs 4293 240 63A. I cant find a reference to this in the 17th edition book. Am i missing a trick here.is there some way or a link that will help me with this.

 

[WDMDL]

What about an IEC 898 or EN60898? Could be BS3871 but you'd at least need to know type B, C, D, 1, 2, 3, 4 etc for checking Zs is acceptable.

RCD to BS4293? Test it! If it performs to the requirements for your work, it's fine.

Simon.

 

[MarkieSparkie]

BS 4293 RCD are the general purpose, stand alone, types that were quite common years ago, but were phased out in the early 1990s. Most commonly found as a front end RCD of TT installation.
When testing BS 4293 type RCD the testing method is the same as normal, but the device must operate within 200mS @1xIΔn. If it's a BS4293 S type (time-delay) RCD, then there is a 200ms time-delay and 200ms fault time i.e. the RCD should trip within 400ms@1xIΔn. BS 4293 RCDs have since been replaced by the BS EN 61008 types.
Assuming the MCBs are of the same vintage they will be BS 3871 types. Remove the MCBs one at a time from the busbar and check whether the data is labelled or moulded on the side checks of the device, it frequently is.
The short circuit capacity Icn of a BS3871 MCB is expressed as an M code, where M1=1000A, M1.5=1500, M3=3000, M4.5=4500A, M6=6000 and M9=9000A.
The trip type is expressed as a numeric value 1-4, where Type 1 (2.7-4 In) is for resistive loads, Type 2 (4-7 In) is for resistive/inductive loads (the most common), Type 3 (7-10 In) for inductive loads and Type 4 (10-50 In) for highly inductive loads.