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I am in the process of hunting for another difficult fault (intermittent tripping RCD, absolutely no faults showing on any circuits and only 2mA fault current in Main earth).
My question does indirectly relate to this... perhaps.
When testing the RCD with my megger 1731 I am not getting a...
I'm a qualified mechanic but always tackled small electrical jobs without incident. wonder if i can get some advice re a 60's potters wheel.
it consists of :
-a 220-250 volt 3 phase, c/s 50, motor
-an largish oval capacitor [with a resistor between the 2 contacts] some distance away from...
Cable zones are vertical or horizontal from an accessory.
I was wondering how this is affected by accessories that are not visible? In theory you could have a cable going horizontal from a socket above kitchen worktop and then down to a socket below worktop which is hidden behind the washing...
Regulation 4188.8.131.52 states ....
Main bonding conductors shall connect to the main earthing terminal extraneous conductive parts.
It then goes on to say...
'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective...
Partly cos I like to know everything... Partly because I'm a geek... And partly because we're going to have some electrical work done on the house which has made me curious.... I'd like to know more about the feed to my house...
The power lines come to us through the garden and reach a pole...
I just wanted to make sure I understood the new regulation above.
I am about to replace some ELV downlights with mains voltage, do these now have to be 30mA RCD protected?
At present they have 100mA protection and the earthing is TT.
Kindly refer the attached Image. There are 2 Places at which I can give reference signals for Emergency lighting.
1. At MXC
2. At LTC (Unswitched & Switched)
What is the difference between the above two? why there is a need to provide input at two different locations?
the problem question I have states:
"the following line to earth values were recorded for six circuits in an installation. What would be the expected overall value when measured at the origin and what action should be taken, if any?"
I understand that an IR reading higher 1 ohm is a pass...
In the past I have used one of these for splitting the cable for terrestrial TV:
This time when I fitted it the TV (at the new TV aerial socket that I had fitted) did not receive a signal whereas the existing TV still did.
I removed the new coax cable from the splitter and...
I bought the Heatmiser PRT-N thermostat to replace my standard analog thermostat. My existing thermostat has a PL, SL, N.
I believe I should have bought the PRT, not the PRT-N. :oops:
From the pictures is it possible to use this thermostat as in the wiring diagram for picture 3...
My assessor said that the minimum CSA for a Main earthing conductor for a TT was 16mm. I questioned this as I thought it was 4mm.
Regulation 542.3.1 states every earthing conductor shall comply with section 543.
Section 543 refers mainly to the adiabatic (reg 543.1.3) or reg 543.1.4 (table...
I'm a Plumber and heating engineer and a new member to your forum.
I have a basic knowledge of electrics but I'm curious about how breakers and Rcd's work and whether they prevent fires.
My basic understanding is the breaker trips if more power is been drawn than is safe and an RCD...
Hi guys, I'm new on here, I'm a level 3 apprentice, most of my experience is commercial and domestic, my boss has just taken on a large industrial job, in which we are testing and rewiring everything, first we are doing the lights, we will be fitting some lighting contacters, which will run...
Can anyone help me understand Zs values.
In the On-Site-Guide page 60 Table 7.1 under the heading Maximum cable length, it states if
Zs < 0.35 ohms for a TN-C-S system
you can have a cable length of 107m
In BS7671 page 58 Table 41.3 it states the
Maximum Zs for a 32A CB to operate within...
Hi all, I've just been talking with a kitchen fitting company as we're currently looking at (surprise surprise) getting a new kitchen. Anyway, we are wanting to add in a dishwasher, and also replacing the existing freestanding fridge/freezer with two separate under counter ones.
I've tried to...
Seaward Electronics are running a free half day PAT Testing workshop in Bradford on Friday morning if anyone is interesting in attending.
This workshop will give those attending an introduction to the subject of PAT. The workshop will look at the legal requirements and standard...
Hi I am studying to become an electrician.
There are a few things I do not fully understand regarding shocks and earth and I cannot find the answers to some of my questions.
Can anyone help me understand the following points regarding a standard TN system.
1) If you are in a loft or a 2nd...
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