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increase

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  1. G

    SAP for Solar Tracking Systems

    Ive now been asked for this a couple of times now, and know where and how the kit works. However has anyone done the SAP calc for this setup, or is there just a % increase in production based on a southerly aspect?
  2. J

    volt drop rule of thumb

    Hi Guys, could anyone explain to me the 1.2 volt drop rule of thumb? i understand the 3% for lighting and 5% for other circuits. any help would be welcome studying for 2391. Thanks in advance.
  3. P

    AGE Of INSTALLATIONS

    I'm often wondering or being asked how old the wiring is, particularly when it's been disguised with new sockets. There are plenty of clues, but I wasn't in the trade when the changes came about. Here are a few to start. Feel free to add dates for other significant changes. When did main...
  4. T

    Doubling up on cables to increase csa.

    Hi everyone. Im a fire alarm guy, who was qualified as a spark, over 27 years ago, to the 15th edition. Just fitting a new alarm system into a kids nursery school, and noticed that a new consumer unit had been fitted since I first quoted the job. The spark has doubled up two 10mm earth singles...
  5. A

    Hertz And Volts?

    After Greetings suppose that you have light works on (240 vac and 50 hz) and machine works on (240 vac and 50 hz) I need to know what will happen for each of (light and machine) if 1- the volts increase 2- the volts decrease 3- the hertz increase 4- the hertz decrease Thanks Best regards...
  6. S

    Zs increase after lowering Ze?

    Hi all, Domestic property rewire. Kitchen ring measured Zs of 14.6 checked the Ze and way up at 580. Banged in an earth spike, Ze now down to 160 Checked Zs at same socket outlet and it measured 80.5 ??? Why would this occur? Just got home not had time to think cleary, any pointers...
  7. S

    excitation voltage

    When we increase excitation voltage, Gen. terminal voltage also increases. What happens to current at Gen. terminal? Please explain
  8. C

    Increase supply current?

    Hi everyone! Sorry for what might be useless questions, but I'm just starting out with my electrician courses. My mum lives in a flat and wants to add a 10.5 kW electric shower which would draw about 44 amps. She already has underfloor heating that uses a maximum of 44 amps (10,590 W) as well...
  9. L

    Are Rcd sales going to increase

    Just wondering, because of the 17th edition, do you think theres going to be an increase of rcd's sales, technology etc? you think its worth putting shares in the rcd company manufactures?

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