I have only ever seen a couple of IT supplies in use, for TNC it is against supply regs for a consumer to combine neutral and earth into a single cable hence on the domestic installation after the suppliers cut-out you should never see it in use.
Funny Incident
- Thread starter gromit
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well doneSpark123 said:
Quote IEE Wiring Regs 16th edition + 2002 & 2004 amendments
Phase conductor : A conductor of an a.c. system for the transmission of electrical energy other than neutral conductor, a protective conductor or a PEN conductor. the term also means the equivalent conductor of a d.c. system unless otherwise specified in the Regulations
Live Part :A conductor or conductive part intended to be energised in normal use, including neutral conductor but, by convention, not a PEN conductor
When I was studying an electrical installation course, just before an exam we were looking at a past paper and one question was 'An overcucurrent is defined as occuring in a circuit which is :
a electrically sound
b as the rsult of a fault
there were also two other answers but I looked in BS7671 and a was right . The lecturer said B was the right answer. I only looked looked in the regulations after however and guess what ........... the same question in the past paper appered in the paper that my group sat. For some one question could have meant the differrence between passing and failing the exam!
a electrically sound
b as the rsult of a fault
there were also two other answers but I looked in BS7671 and a was right . The lecturer said B was the right answer. I only looked looked in the regulations after however and guess what ........... the same question in the past paper appered in the paper that my group sat. For some one question could have meant the differrence between passing and failing the exam!
Read this carefully - the question with answer b on the end - it makes no sense. The lecturer was wrong. IMO, the question was badly worded, and A would have been a more appropriate answer. The circuit is electrically sound, but now has an overcurrent running. Doesn't mean theres anything wrong with the circuit, or that there is a fault. Someone might have plugged too many appliances in.
CAWORK said:
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