Could someone please clarify for me what is meant by the term "Method of seperation"

[h.abrar94]

Hi I'm soon to take the City & Guild 2396 course.

Upon reading the examiner report in particular December 2016 and June 2017 in the section "Verification" it states the following

December - 2016
"Majority of candidates were unable to explain the correct method of verifying Separation despite having Guidance Note 3 as permitted material. Many confused Separation with the method of testing SELV circuits."

June - 2017
"Majority of candidates were unable to explain the correct method of verifying separation despite having Guidance Note 3 as permitted material. Many focused on insulation resistance of SELV circuits instead.

I have read in GN3 and looked at the separation method and from what I can understand, in Page 24 & 25, as well as in the schedule of inspection under the section 6.0 - "Other Methods of Protection" under the sub section which states "Electrical separation for one item of equipment. E.g Shaver unit". It seems to me that this is the method of separation, however I'm not certain why majority of candidates specified SELV circuit.

Could someone please clarify for me what is meant by the term "Method of seperation"

 

[telectrix]

sepatation is where band 1 and band 3 cables are separated. e.g. LV (mains) from elv (under 50V). various methods include compartmented trunking, spacing on trayor basket, routing cables at a distance from each other,

 

[DPG]

sepatation is where band 1 and band 3 cables are separated. e.g. LV (mains) from elv (under 50V). various methods include compartmented trunking, spacing on trayor basket, routing cables at a distance from each other,

I don't think he means segregation Tel, he means a separated supply.

 

[Deleted account]

TBH not sure what is meant by methods of separation Myself Based on the 2016 and 2017 examiners notes.

I thought it was selv, where by there is no direct contact with between the incoming and outgoing. primaries and secondary’s are separated and current is transferred via the windings.
but the examiner says not!

 

[DPG]

I think we are talking separation by means of an isolating transformer aren't we?

 

[Deleted account]

I think we are talking separation by means of an isolating transformer aren't we?

Isolating a transformer? Or separation within the transformer?

the examiners note isn’t too clear.

@h.abrar94 was there any more to the examiners notes.

 

[SJD]

If I look at my EIC checklist (part 6), it refers me to 413, perhaps have a read of that section.

● SELV system, including the source and associated circuits (Section 414)

● PELV system, including the source and associated circuits (Section 414)

● Double or reinforced insulation i.e. Class II or equivalent equipment and associated circuits (Section 412)

● Electrical separation for one item of equipment e.g. shaver supply unit (Section 413)

It doesn't seem to mention much about shavers, despite that being mentoned in the checklist above.

 

[DPG]

Isolating a transformer? Or separation within the transformer?

the examiners note isn’t too clear.

@h.abrar94 was there any more to the examiners notes.

Separation by virtue of the isolation transformer.

 

[h.abrar94]

TBH not sure what is meant by methods of separation Myself Based on the 2016 and 2017 examiners notes.

I thought it was selv, where by there is no direct contact with between the incoming and outgoing. primaries and secondary’s are separated and current is transferred via the windings.
but the examiner says not!

Hi Paignton Pete

This is also what I thought but as the examiner reports states that majority have failed in this. The report does not give a mention or a clue by what they mean the term "method of separation"

 

[h.abrar94]

Isolating a transformer? Or separation within the transformer?

the examiners note isn’t too clear.

@h.abrar94 was there any more to the examiners notes.

Hi

No sorry that all they mentioned in regards to the "Verification" section

Similiar report has been stated in the examiner report on March 2019. They state the following

"Very few candidates demonstrated a suitable level of understanding the requirements for testing separation of circuits, with most simply stating the requirements for testing the insulation resistance of a SELV circuit."