use these formulas to solve the assignment in class Monday.
FOR DIRECT PROPORTION RATIOS TURNS and VOLTAGE
N p = E p
N s E s
FOR INVERSE PROPORTION RATIOS VOLTS and AMPS
E p = I s
Es I p
Sunday, December 7, 2014
Thursday, December 4, 2014
Transformer Taps
this is from ACME electric, a transformer manufacturer.
Taps are provided on some transformers on the high voltage winding
to correct for high or low voltage conditions, and still deliver full
rated output voltages at the secondary terminals.
Standard tap arrangements are at 2.5%and 5% of the rated primary voltage for both high and low voltage conditions.
For example, if the transformer has a 480 volt primary and the available line voltage is running at 504 volts, the primary should be connected to the 5% tap above normal in order that the secondary voltage be maintained at the proper rating.
The standard ASA and NEMA designation for taps are “ANFC” (above normal full capacity) and “BNFC” (below normal full capacity).
What are taps and when are they used?
Standard tap arrangements are at 2.5%and 5% of the rated primary voltage for both high and low voltage conditions.
For example, if the transformer has a 480 volt primary and the available line voltage is running at 504 volts, the primary should be connected to the 5% tap above normal in order that the secondary voltage be maintained at the proper rating.
The standard ASA and NEMA designation for taps are “ANFC” (above normal full capacity) and “BNFC” (below normal full capacity).
Wednesday, November 19, 2014
Friday, November 14, 2014
Blueprint module shop grade
use the image below to determine the number of each type of lighting fixture shown on the reflected ceiling plan. this work will be collected Monday November 17, 2014.
Thursday, November 13, 2014
Wednesday, November 12, 2014
No rings around electricity
Fla. man electrocuted in wedding ring mishap
PORT ORANGE, Fla. - The routine work of installing a dishwasher ended tragically for a Florida man last Thursday, authorities said.
CBS News Orlando, Fla., affiliate WKMG, reports Jason Ferguson, 33, was electrocuted when his wedding ring came into contact with an unknown object. Police said the accident happened at his in-laws' home in Port Orange while the family was preparing to eat dinner.
Around 7 p.m. they noticed his arm was stretched behind the appliance while he was kneeling. Family members said he was unresponsive and they administered CPR, police said. Ferguson later died after being taken to the hospital.
It is unclear what cause the electrocution, but police said Ferguson, who installs and repairs items at the home could possibly have contacted a copper wire..
CBS News Orlando, Fla., affiliate WKMG, reports Jason Ferguson, 33, was electrocuted when his wedding ring came into contact with an unknown object. Police said the accident happened at his in-laws' home in Port Orange while the family was preparing to eat dinner.
Around 7 p.m. they noticed his arm was stretched behind the appliance while he was kneeling. Family members said he was unresponsive and they administered CPR, police said. Ferguson later died after being taken to the hospital.
It is unclear what cause the electrocution, but police said Ferguson, who installs and repairs items at the home could possibly have contacted a copper wire..
© 2014 CBS Interactive Inc. All Rights Reserved.
Scaffolding malfunction
the msn link posted here should take you to pictures and a short description of what took place at 1 World Trade Center.
http://www.msn.com/en-us/news/us/dangling-workers-rescued-from-world-trade-center/ar-AA7MjGq?ocid=DELLDHP
http://www.msn.com/en-us/news/us/dangling-workers-rescued-from-world-trade-center/ar-AA7MjGq?ocid=DELLDHP
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