Completely agree! While most socket-outlets are rated 20A, the plug-top fuse will be limited to a maximum of 13A (approximately 3kW).
Remember that according the the ESQCR, the voltage used in calculations is 230V rather than 240V. We use 230V because current is inversely-proportional to...
Short Circuit
In simple terms, a short-circuit is where the line & neutral conductors touch each-other, resulting in a huge amount of current flowing through the circuit (and circuit-breaker) which causes it to rapidly trip.
Over-Current
In simple terms, an over current occurs when the rating...
The course lasted around 8 months (two weeks on, two weeks off).
It was a lot of money, and I know other colleges offer the course at a cheaper price. Like I say, it's the tutors which make the difference, going the extra mile where needed and having exceptional knowledge.
Halford give-out trades-cards to electricians?
I've always used my freind's card (a mechanic) when buying oil, etc. I presumed you had to be a mechanic to obtain their trade card.
What did you say to them?
When calculating diversity, the recommended values are only advice. Sometimes it's necessary to increase/decrease their values based on the circumstances. If you're unsure, you can't go wrong with 100%.
I'll explain the following in basic terms for better understanding (other electricians, I know my terminology but please ignore for this post):
RCD (Residual Current Devices)
- Trips during earth-faults
- Doesn't trip during short-circuit faults
- Doesn't trip during over-current faults
An RCD...
This is a three-phase fuse which is installed on each of the individual phases. It's imperative that all phases simultaneously disconnect, opposed to a singular phase. The "firing-pin" is used to trigger the disconnection of the other phases during a fault to ensure safety.
Agree with previous comments, these are for use with HV (High-Voltage).
Why do they contain an explosive-charge?
Put simply, high-voltages can jump through the air (like a police taser for example) and higher-voltages will jump considerably further than lower-voltages; the result is referred to...
Fully understood and I agree with you. Upon further investigation, I'm unable to backup my statement regarding phase-balancing with any regulations, and therefore I stand corrected.
It seems strange that there doesn't appear to be any requirements in the regulations regarding phase-balancing...
I'm surprised you asked, but of course:
BS7671 Amendment 3 411.3.3 'Additional Protection' (i) states:
"Additional protection by means of an RCD in accordance with Regulation 415.1 shall be provided for:
(i) socket-outlets with a rated current not exceeding 20A"
BS7671 Amendment 3 415.1...
Completely agree! It's a simple case of evaluating costs:
If the additional cost associated with an innovative time-saving solution outweighs the cost of labour involved with other existing solutions, resulting in savings which are greater than the potential risks involved; then the new...
The Kewtech KT63 user-manual shows that the maximum continuity result shows as 19.99kOhms, meaning that the conductors tested are open-circuit.
The scary thing is, ring-final circuits can still function as normal when a single live-conductor is open-circuit, presenting a danger of over-current...
Completely agree. When using singles, the permanent-line usually goes directly to the switch rather than the light.
In all honesty it doesn't strictly matter, the advantage of using singles is that your circuits can be shorter, by connecting from A-B directly instead of requiring additional...
Completely agree with previous comments.
However I'm a little concerned that you've asked this question, given the increased-dangers of three-phase, while the answer should be common-knowledge for a competent person.
Please don't be offended by this, perhaps there's more-to-it and a bigger...
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