Answer / jesudoss

can ..u can use electrical interlock acb between mccb.ACB
should have NO,NC contacts.now new MCCBs also have NO,NC
contacts(ex:ABB TMAX - this MCCB have
charging,closing,opening coils also).

Answer / g.pattabiraman

For positive, fail safe interlocking, between ACB and MCCB to prevent both getting ON at any given time,
use of UNDER VOLTAGE COIL, along with auxiliary switches of the breakers is needed

ACB under voltage coil in series with MCCB aux. N.C contact
and MCCB under volt coil in series with ACB aux. N.C contact will give this fail safe protection

Motor operation or manual operation are user choice

What is the temperature and cooling aspects of dc motor

1 Answers  

---

How many earthings are required for commissioning the Transformer?

14 Answers   Dalmia Group, HSL,

---

Can I use RCCB in moisture control device in a submersible pump.

2 Answers   TATA,

---

What is the permissable nutral current of three phase system as per IS standards?

0 Answers  

---

Why are transmission lines multiples of 11? Is it because of some historic reason ? Or is there a scientific base to it?

5 Answers  

---

Does dry and oil transformers both require dedicated neutral, because in my project we are using 2500kv dry star delta transformer, where they say neutral not required and even it is not provided in our substation. can u let me know

2 Answers   Voltas,

---

Which standard we are following earthing resistance test

0 Answers  

---

what is the thumb rule to know current carrying capacity of copper conductors of different size.

1 Answers  

---

why the supply frequency in india is 50hz?

2 Answers  

---

In Generator How suction compression power and exhaust works ?

0 Answers   Sify,

---

what is the purpose of measuring % impedence?

1 Answers  

---

Explain the laying procedure and laying depth of submarine cables under sea?

1 Answers   Schneider,

---