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Attended a seminar today based on EV charging points. The broken PEN conductor was mentioned and converting to TT.
1. How often does a PEN conductor go down?? My understanding was that they use PME to reduce this risk further.
2. I asked the question as to should we be installing...
Here's a question that I was asked earlier.
If you have SPDs installed in a DB is it permissible to terminate the main earthing conductor into the SPD first then the DB earth bar?
Or must it be terminated in the DB earth bar first then the SPD?
I'm trying to calculate CCC & VD for H07RN-F Single core cable. Used for event powerlock runs.
TPN AC - Ref Method C - Flat & Touching
Table 4E1A/B covers Single Core 90*C thermosetting insulated cables, which I have used correction factors to convert these values to flexible cable but...
Would appreciate your comments on the following.. I am currently involved in the refurbishment of a building with 2 service heads (both in use) but only one gas intake and one water intake. What are the main bonding requirements in this situation? I am assuming both MET's require a...
At the origin the installation is TT.
Plan is to install a submain to a new db. Not carried out all the calcs yet, but my question is does the swa require an earth conductor in the cable.
Basically planning on running a phase and neutral or perhaps even 2 x phases and neutral.(the cable will be...
I have an engineer who has failed a wall mounted data cabinet because the PDU is hard wired into a switched fused spur, the spur is spurred off a ring main in 2.5/1.5 twin and earth.
He has failed it under regulation: 543.7.203 The wiring of every final circuit and distribution...
Domestic TNCS, main earthing conductor runs to water pipe, bonds via clamp with label, cable is continuous, then runs on to MET in DB.
Seems wrong, but cant find specific reg to say so....any thoughts?
I am after some help/Advice if possible please
A SWA sub main Distribution circuit has been given a Code 2 Rating on a recent EICR due to a high Zs of 2.8 ohms. The cable is 180 metres long and runs underground in ducting.
The Install is from a few years ago when a new Substation was put...
I know the thread title sounds bad but hear me out. I have wired an intermediate switch set up with feed at one switch, switch wire at another and twin and earth as my strappers between to an intermediate switch. My customer wishes to use lightwave switches for the three posistions mentioned...
Hi guys, I've questioned something at my workplace and after receiving my answer I'm not overly convinced and would like some other experienced gods to chime in :)
On a new install in an existing property today I went to bond the Water and noticed it was already done, clearly many moons ago...
i understand the need, as I see it any circuit with a likelihood of more than 10 mA earth leakage should be subject to high integrity earthing.
This requirement can be achieved by many methods and I can see the sense in some.
Using RFCs instead of radials gives two paths so in the event of a...
Been nosying about at my brother's new house this week and fixing a few bits and bobs. The electrical installation mainly dates back to the early 80's at a guess and apart from a few broken accessories and a lack of RCD protection (now fixed) it has all checked out okay. PME earthing.
Doing inspections today and found a couple of properties with under sized earthing and bonding conductors. Earthing system is TNC-S and features 6mm earthing conductor and 6mm bonding conductors.
I normally code 6mm bonding conductors as C3 and am happy to do so here too, but should I be coding...
I've recently visited a large 8 bedroom Victorian house. It has a three phase supply. One of the phases feeds the main house, its wired through a 100 amp main switch/ isolator. The Suppliers Side is 25mm tails but the customers side to the main house consumer unit appears to be 16mm...
I have a 6mm main protective bonding conductor from a 1981 install; adiabatic equation says this is sufficient and no signs of thermal damage. (Discussed in separate thread).
Gas was not bonded, it's a big job to run new cable so I've used redundant water bonding as now all plastic to bond gas...
I am carrying out an inspection on a domestic TN-S system. First observation is that I can see 16.0mm earthing conductor fro CU to MET - but then is steps down to 6.0mm connecting to the supply cable.
This should be 16.0mm - shouldn't it? I am going by table 54.7 in the big yellow book...
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