can u name these earthing arrangements from domestic properties???

[electrophile007]

hi folks can you please help with identifying these earthing arrangements?
thanks image 1

2
3 455b
note image 5 b is the c/u for MEA 5 is this safe with no RCD???

 

[Marvo]

Welcome to the forum Electrophile

 

[Engineer54]

Why don't you start by telling us what ''YOU'' think are the earthing arrangements to these photo's?? Though how you expect to determine the earthing arrangement from looking at the internals of CU's is another matter altogether!!

 

[davesparks]

The images which actually include the head appear to probably be a TN arrangement of some sort.

Can't really say much more without a bit more information!

 

[Knobhead]

You’re an apprentice, is this homework?

 

[Paul.M]

1 = No earth although it has a PME head. The gas pipe is to close to switch gear, may need to sort that one out.

2 = PME but badly done.

3 = Cant tell.

4 = PME with really bad painting.

5 = It's a CU?

 

[davesparks]

For 1 and 2 I'd be inclined to say it may not be PME because those black heads are more normally used on another arrangement in this area.

 

[mechelec]

Depends if the link is in the cutout between n an e. Testing would confirm. Can't tell from just looking.

 

[7029 dave]

hi folks can you please help with identifying these earthing arrangements?
thanks image 1

View attachment 285102
View attachment 285113 View attachment 285124View attachment 285135View attachment 285145b
note image 5 b is the c/u for MEA 5 is this safe with no RCD???

BYPASS, report ASAP.

 

[trev]

1 Guess at TT
2 PME
3 No idea
4 PME
5 No idea.
All of them look a bit rough to me but why do you ask?

 

[electrophile007]

Im not sure as to the arrangements.
image 2 gave a ZE of 123 ohms and IPF 1.66KA so im thinking TT
image 3 gave ZE 0.25 Ohms IPF 1.97 KA and ISC 1.46KA so im thinking PME
image 4 ZE 190 Ohms and IPF 128KA so im thinking TT again
image 5 and 6 are the same location ( newbuild block of flats about 10 years old ZE 0.25 Ohms IPF 0.905KA ISC1.36 KA so im thinking PME however there is no RCD at the C/U would this be unsatisfactory if a EIC report was done???
thanks for all your input by the way folks

 

[electrophile007]

yeah ive been asked to do a mock EIC report by my boss

 

[electrophile007]

yeah the boss is looking to know if i have retained info from collage

 

[davesparks]

Images 1,2,3 and 5 all have a clearly identifiable suppliers earth connection so somehow I don't think any of them are TT

 

[trev]

Just because there's a PME head there it doesn't mean the link is there mate. I though TT because there's no cable going to it