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What do people use for their calculations??? I've seen so much contradiction in books. Some say you must use 230v because thats the European harminisation. And some say you must use 240v because thats what it actually is......?? :?

Of course, stupid mistake. :oops: Thanks for pointing that out Nozspark.

OK then, just to clarify, let's say i had a 'short' between live and neutral. The resistance measured is 0.24ohms (measured at th CU). Socket outlet, 2.5/1.5 t&e Resistance in milliohm per metre = 19.51 (OSG) 0.24 ohms (expressed in milliohms is 240 milliohms) 240/19.51 = 12.30 metres...

So how precise is the method i've mentioned?

Ah, so if i switch to the low resistance setting......and use the figure recorded? Cheers breezer

I want ot be able to calculate the distance of a 'short' on ring circuit. How do i change my IR reading of 0.00 megohm to the exact ohms?

I asked the same question a few weeks back and the consensus was a choice between the Megger 1552/3 or and Fluke 1652/3 I went for the Megger 1552. Great piece of kit! (btw, the Fluke is also a great piece of kit, i just found the Megger more user friendly)

6A Type B circuit breaker to BS EN 60898. The 'current for time' in BS7671 is 0.1 to 5 seconds disconnection time for 30A of current. I'm looking at the chart (fig 3.4 on page 199) and the 'time,seconds' line actually goes upto approx 12 secs. I don't understand why? :?

I havn't received mine yet, ordered weeks ago.... :roll: :wink: I'm sure it will turn up this week. I look forward to the read.

Hi 'Remove all lamps during an insulation resistance test'. My undersatanding is because it will affect the results of the test, not because they are vulnerable to the test voltage unlike electronic devices such as dimmer switches, touch switches etc... Am i right or wrong?

This is his existing lighting circuit: Potentially 2000W of existing lighting. Therefore when applying diversity i get the following: 2000 x .66 = 1320 1320/230 = 5.7A He has a 5a rewirable fuse protecting the circuit. This is what he wants adding to the circuit: 2 x 500W PIR...

What about this.... Take a feed from the loop supplying the back bedroom. Run it outside in 1.5mm Hi-tuf cable to the height they want the light, which is about halfway. Then terminate the live into a 'choc block' with neutral and earth terminated in the light. Then run a switch cable down...

I've been asked to fit a PIR security light for friend. I've been to his house today to make sure there is a decent place to take a feed from and to be honest i'm struggling to find anywhere. The house is full of laminate flooring!!! The only place to take a feed from without ripping up his new...

No i've not actually measured Ze yet. I've just assumed that Ze is up to 0.8 ohms with it being TN-S. My house has no MEB, it's something i need to do asap. Again, thanks for your help with this. As you've probably noticed i'm still training. I've just bought my tester and i'm trying to...

Sorry to be a pain with this. I've measured Zs for my downstairs ring using the socket method (Megger 1552). The result is 0.26 ohms. The circuit is protected by 32A MCB to BS60898, so according to GN3 the result is ok. However, my supply is TN-S, which would mean my Ze is approx 0.8 ohms...

There was, sorry Adam. I took it out as it was a pretty dumb question. I was hoping i'd of deleted it in time before someone read it. :oops: Thanks for the replies though fellas, it's lot more clearer in my head now. :wink:

Ok Cheers.

Ok, let's say i had done some minor work on a lighting circuit. The Minor Works Certificate asks for EFLI. Because the work was only completed on the lighting circuit would you only use R1 + R2 from the lighting circuit to add to Ze? I need to get this clear in my head.

Does it matter what circuit you take the R1 + R2 measurement to add to Ze for your EFLI? GN3 methods show the R1 + R2 value taken at each ceiling rose in a lighting circuit and to record the circuit extremity reading then add to Ze. I understand this, however, what about R1 + R2 on other...

I have 4 dwarf conifers. One of them is starting to turn a light brown at the edges. The other 3 are perfect. What could this be?