Answer / ravi

By Smoke Simulation Method.......

Answer / joy

simplest way is apply a certain volume of smoke in a room
where the detector is placed that would be enough to trigger
the SD to send an alarm signal to its control panel that is
if this is not just the battery operated one.

Answer / kannara

You can use magnet for test smoke detectors.hold a magnet near to the detector,the detector will activate with in seconds and give fire signal to main panel

Answer / arun kumar .k

In smoke detector uisng the Bymetalic strips
It is like nc/no contact when temprature increase it will
trigger the hooter circuit

1. what is the power factor and whatis his losses 2. what is the working procedure of 51RNB AND 87 relay

3 Answers   ABB,

---

How to control speed of DC motor with AC power?

7 Answers   vguard,

---

where the lexical paramater will use in fron end?

0 Answers  

---

where connected OLTC for transformers?

3 Answers   Apollo, CBRE,

---

resitance in ac=1.6*resistance in dc

3 Answers  

---

how to operate and maintenance of 1500 kva diesel generator set

0 Answers   Supertech,

---

how hazordious area is classified at an oil & gas plant and categorise suitable class of electric equipment in that area like induction motors, LCS, Lighting Fixtures Fluerescent/Flood lights Mercury& sodium lights, J.Bs, Power Cables etc

0 Answers  

---

how to determine Sq.mm size of finolex power cables.

0 Answers   Finolex,

---

When star connection of motor is use?

1 Answers  

---

Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 Answers  

---

WHAT IS ND RELAY AND HOW DOES IT WORK?

2 Answers  

---

Please give me a solid reason there are 2 ELCB's If we take Phase from ELCB NO:1 an Netural from ELCB N:2 why ELCB is tripping when we connect the Load?please brief me with detail

3 Answers  

---