- Jul 15, 2016
- 23,296
- 1
- 29,151
- 315,788
- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Electrical Engineer (Qualified)
Disregard the supplementary bonding question. If services are insulated from earth but still have a main bond in a TNCS system & have accessories that give a pathway surely that would be an issue & would need noting.
- Mar 13, 2019
- 1,816
- 3,289
- 7,788
- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Practising Electrician (Qualified - Domestic or Commercial etc)
Not quite following you. Is your concern diverted neutral currents, or is it open supply neutral causing a rise in voltage on the earthing system?
- Mar 13, 2019
- 1,816
- 3,289
- 7,788
- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Practising Electrician (Qualified - Domestic or Commercial etc)
Any metalwork connected to the MET could rise in voltage compared to true earth under an open supply neutral fault (on TN-C-S), and that would include the bonded pipework. However, in the property you're inspecting, the pipework is connected to the MET in numerous places, so removing the main bond isn't going to make a real difference.
Either way, the regulations permit the general use of TN-C-S, so it wouldn't be something you would code on an inspection. There are circumstances where TN-C-S is not permitted (eg caravan hookups) in which case you would code it
Similar threads
OFFICIAL SPONSORS
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
