Service factor is gearbox horsepower rating over motor horsepower.
Because rating of films depends on the audience not by producers. That's why rating from producers are not mention as valid.
The KVA rating of a transformer is based on how much heat the transformer can dissipate. The BIL rating is based on how well the windings are insulated. There are other "ratings" as well. Rough calculations can be done, but tests are generally performed to prove the calculations (transformer designers will design on the conservative side to insure the transformer meets specification). These type of calculations are best done by a computer. You will struggle to determine the hot spot max temperature rise in a transformer by hand.
It's a G Rating...:D
the age rating in the UK is 15
2500 Amps
ka of mccb=transformer(KVA)x100/1.732xsecondary voltagex%impedence of transformer
faradays second law
thanks ,it should be 400amps.
An SPN MCCB is a Solid Pole Neutral Molded Case Circuit Breaker.
Basically tpn means the tripple pole + nutral protectin mbc .
what is the difference between utilization category A and B of MCCB's
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there is three difference in ACB and MCCB, 1- ACB on off operation is easy as com pair to mccb because acb having charged spring force. 2- acb having much delay time period (category A) and mccb having low time period (category B) 3- the main diffidence is that acb having high raptching capacity and mccb are low.
want to know
To calculate the noise reduction rating (NRR), you subtract seven from the decibel rating of the hearing protection device and then divide the result by two.
The difference between a tpn mccb and a 4 pole mccb is rather negligible. The only real difference is that a 4 pole mccb works a little bit faster and allows for a strong network connection. The connection with a 4 pole mccb is just a bit more reliable.