Hi All,
When I consult Table 41.3 for a Type C Breaker rated 16A I see s max Zs of 1.37 Ohms. However this value is defined for both a 0.4s AND 5s disconnection time. This is obviously correct so I am missing something. Fig 3A5 also shows the table 0.1s to 5s. Can anyone explain please...
Hi All,
I am hoping to that someone might be able to point me in the direction of a suitable resource that will help me interpret the details of site electrical plan that will allow me to get the necessary details that I can use for cable calculations.
I came across this issue when I was...
Well said, for the examiner it is a matter of choosing distracting options that are not outrageously wrong and this question does it quite well; although recovery voltage would never exceed the normal supply.
Any break in an electrical circuit will give rise to a change of current and this will cause an induced voltage. The larger the rate at which this collapses and the part of the cycle at which the break occurs could give a disturbances. In fact any switching will have some effect that way.
Yes, I agree that the wording is important and I'm certainly very happy that answer (c) is the only intended correct result But circuit breakers can cause very substantial electrical disturbances.
I only ask the question because I have to explain why that particular option is wrong. In most...
Hi All,
I am researching advice to give to candidates for the Regs exam. I came across the following question:
1.
The fundamental principles of BS7671 state that persons and livestock shall be protected against injury as a consequence of over voltages originating from
a. motors...
That's fantastic ashrow. It's made the timespent on the coding worthwhile because I thought the statistics would be important for confidence in taking the exam.
I'd love to hear your feedback on the tutorial as well as the tests.
Also, I would be grateful if you could post a message on this...
Hi all,
I am a retired engineering professional and I recently got involved in helping my grandson with his 17th Edition. Well I decided to provide some help with the aid of some software (and some assistance from members of this forum).
Like most projects, what started as a simple idea just...
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