Answer / raveendra nath

PI value is the ratio of insulation resistance at 10
minutes to the 1 minute value...

PI = IR(10 min) / IR (1 min)

For good insulation, PI >= 2
PI more than 1.5 is acceptable...
PI less than <1 indicates Bad insulation

i am using star-delta connections with reverse/forward direction motion of the 75hp induction motor.What should be the ratings of Main,Delta and Star contactors and why?

1 Answers  

---

what is a power factor?

0 Answers   MPWU Kiribati, Thermo,

---

How cable from Kit-Kat to main switch, from starter to motor are designed?

0 Answers  

---

Vaccum circuit breaker

0 Answers  

---

why the capacitors works on ac only

5 Answers  

---

I have c license but I don't know eligibility of Max Kilo Volts under the electrical licensing board.

0 Answers   MindSquare, Sical,

---

what is rated speed?

4 Answers   Actavis,

---

how to setting voltage RTCC panel

0 Answers  

---

WHAT IS SPEC OF CLEANROOM MOTOR AND LIGHT FITTINGS?

0 Answers   Apotex, JLL,

---

What is reason to get a power factor nearly zero in resistive loads

2 Answers  

---

mccb service sittings be done?

0 Answers  

---

what is pf. how to calculate capacitor bank value to maintain unity pf.

18 Answers   JH, Saint Gobain, Supreme Treves,

---