Zs test at last lighting point reading "trip:"

[james king]

any ideals on why it said trip i have a megger mft 1553. testing between live earth and nutral with lead test. but dont work lol

any help will be great thanks .

 

[sparkswillfly]

probably because your putting a fault current of around 20amps on a 6a breaker either step up the breaker just for the test or use r1+r2+ze

 

[james king]

no i use a no trip witch put i think 10amps thru it ok il just do the maths lol thnaks for ur help.. also i take it ur a expericnece spark can u help with a few more testing Qs??

 

[sparkswillfly]

post your questions they will allways get anwers by the many knowledgable people on this forum

 

[james king]

well u say that... some people do not.

all it was is i tested a rcd to day i got a reading of 18.1ms i think on 1sec and reading of 4.9ms on x5 can u help with the mas tripping times?

 

[JulianC]

RE: Zs trip reading - ensure you have a good connection on the contacts when carrying out the test. If any of your probes lose contact for a moment the meter will read trip. If you are using a croc clip to connect the earth test lead, make sure this is clamping firmly.

 

[sparkswillfly]

what mass tripping times if your rcd is rated at 30ma 1x rated rated current =18ms=fine 5xrated current=5ms=fine = no mass tripping

 

[james king]

thank u very much

 

[Risteard]

probably because your putting a fault current of around 20amps on a 6a breaker either step up the breaker just for the test or use r1+r2+ze

Never EVER use a higher rated MCB. If your meter doesn't have a No Trip EFLI setting (which his Megger MFT1553 DOES have) then it should be calculated (i.e. Zs=Ze+(R1+R2)).

no i use a no trip witch put i think 10amps thru it ok il just do the maths lol thnaks for ur help.. also i take it ur a expericnece spark can u help with a few more testing Qs??

Loop test is around 26A I think. No trip is around 15mA (not 10A).

 

[acvc]

This tripping problem has come up many times with the Megger1552 and 1553s. It's worth considering that there may be a design fault.

Anyone interested just search the forum for similar posts.

 

[BAZZA]

I have to agree with JulianC, I have found on many occasions that if the probes have a bad connection that the meter shows fail..

 

[Sintra]

I have to agree with JulianC, I have found on many occasions that if the probes have a bad connection that the meter shows fail..

Yes it only takes 1 probe to lose connection for a split second to get a trip display.

 

[acvc]

I've had it also many times, apparantly randomly, it's getting to be a bit of a P.I.T.A. I've always made sure the connections are good, and still it randomly occurs. I do the Zs by calc when it does happen now.

I must admit that I wasn't aware that a split second disconnect could lose the test though.

 

[james king]

cheers for that every one just bit strage had it happen few time and wondered what was going on i use my cals to do Zs but stil wanted to no y it happend cheers

 

[Megger TSG]

As previously mentioned ,during a no-trip test, a momentary break in either the neutral or earth connection will cause "trp" to be displayed as the MFT assumes an interruption in supply.

A poor connection in the circuit cpc can also cause this issue.

Regards

Megger TSG

 

[baazab]

please can anyone help.zs on lighting useing 3-leads .where do they go im useing megger mft1553.

 

[Guest123]

It shows you in the manual.

 

[Amp David]

Never ever had my 1552 trip a 6 amp MCB when testing loop on high current setting.

 

[baazab]

thans for reply,but manual is not takeing me anywhere.

 

[Guest123]

Megger Manual

Try this, page 4.

 

[baazab]

lenny one more question pls.I HAVE 3-LEADS COMEING OUT FROM MY MEGGER,looking at the one way switch for the lighting i can see brown-com switchwire-L2 and earth CNNECTED TO THE META LBOX,MY Q IS WHERE DO THE 3-LEADS FROM THE MEGGER GO TO.

 

[Sintra]

No offence baazab but by the sounds of it you don't seem competent enough to be messing about on a live installation.

 

[baazab]

Im testing my own board for my 2391exam

 

[Sintra]

Sorry mate, for a 3 lead test with the megger you need to test at a point on the circuit that has a neutral ie. the light fitting or rose.
The green lead connects to the earth the black lead connects to the neutral and the red lead connects to the switched line.

 

[baazab]

Im testing my exam board for my 2391 exam,canyou help please

 

[baazab]

Sintra thanks for that information,so you saying you cant do zs from a one way switch,pls correct me if i understand you wrong

 

[Guest123]

As my esteemed colleague has said in order for 'no trip' test with an MFT you need a neutral present. With only L&E present you can only use the high current loop test function.

Again Page 4 of the link I posted shows this.

 

[Sintra]

Not on a circuit that is RCD protected and has no neutral in the switch. For an RCD protected circuit you have to use the no trip setting on the meter and 3 leads which means you need a connection to neutral.

If the circuit is not RCD protected then use the high setting with 2 leads (red & green) connected to line and cpc in this case it could be tested at the switch.

 

[baazab]

Sintra and lenny you been very good i just wantto say thanks,zs is clear i can do it.

 

[Amp David]

2391 good luck baazab, sounds like you've cracked the practical, don't know about the written part though

 

[pushrod]

Hi Baazab, make sure you use the supplied little plastic shrouds that go over your test leads when doing any live testing very important for preventing interesting flashes and bangs and would probs mean a fail in a practical exam.

 

[Amp David]

Can someone please remind me again, what page of the manual should I be looking at?

 

[Andyp63]

Your tester will read trip if you momentarilly lose contact with the earth connection , which on the meggar1553 is easily done if you testing at a lighting pendent because those leads are about 4 inches to short if you don't use steps and if your doing a no trip rcd test on a lighting circuit it almost becomes a two man job !

 

[Jimmy Boy]

I have just bought one of these I will let you know if they pan out well, surely a tad easier than holding probes ?

 

[Spudnik]

Liking the kit there Steve.

Im getting more and more tempted, along with my new tester i am thinking of purchasing

 

[Guest123]

Surely you cant be thinking of retireing the 'seperates'..........

 

[Spudnik]

Indeed its a possibility.

Only reason being, is that i havent bought anything at all this tax year

 

[pushrod]

i got a set of those as well off ebay a few weeks ago - really fancied the yellow/orange socket and see ones but they were £16 dearer. bound to lose those dark lightmate ones in the bottom of my bag

 

[Jimmy Boy]

I've got the 1553 it seduced me with the two lead options and Blue Tooth, doubt I will ever use the BT though it seems a ball ache, it has taken me ages to get used to the Meggar the dials aren't the best or clearest, I had Kewteck singles before but the RCD tester though claiming to be non- trip doesn't now work with modern RCD's as I think the new RCD's are more dc sensitive and I think the old Kewteck used to send a dc pulse down to annoy the RCD long enough to do the test, but not sure on that

 

[Jimmy Boy]

i got a set of those as well off ebay a few weeks ago - really fancied the yellow/orange socket and see ones but they were £16 dearer. bound to lose those dark lightmate ones in the bottom of my bag

Just spray them mate with line marker...Cheap as chips..