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Question
what is different between IP55,IP54 and IP66?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Ingress Protection Rating consists of the letters IP
followed by two digits and an optional letter.It classifies
the degrees of protection provided against the intrusion of
solid objects (including body parts like hands and
fingers), dust, accidental contact, and water in electrical
enclosures
IP55-(5)dust protected,(5)Water projected by a nozzle
against enclosure from any direction shall have no harmful
effects
IP54-(5)dust protected,(4)Water splashing against the
enclosure from any direction shall have no harmful effect
IP66-(6)dust tight,(6)powerful water jets
 
Is This Answer Correct ?    67 Yes 4 No
Milind Parashar
 
Answer
# 2
shall specify "louvers" 
Is This Answer Correct ?    6 Yes 1 No
Preveen
 
 
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
When we change the tap position of 10MVA transformer it suddenly tripped with Out of step indication and also with Static differential relay indication, Transformer Bucholz relay indn and Low oil level indication. Before 1 week the same problem occured by changing the tap position. but at that time only oltc bucholz relay activated. After testing the TxR Relay team & PET team cant find any solid reason. The values are ok also. So plz answer wat's the reason for this incident? anybody plz help.   3
what is difference between megger & Contact resistance meter & its Application?   2
What is the RMS Value. Please discribe in detail Bhel 13
what is S.D.F stands for ? (S.D.F unit 80 amp , TPN )   6
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1. what is exciting winding, rotor winding, startor winding. and how it works? in ac generator   3
in GEAFOL Cast-Resin trnaformer of 11/.72kv which has tapping of 11550v,11250,11000,10246v in primary side. To obtain 700v. which tapping should be used of HV side as we have 11000v/720v tapping now .   1
what does the transformer connection symbol YNaod1 mean ?   2
what is the formula to find battery back up of ups?   3
how to find out speed of single phase motor BARC 6
Why we use Carbon & graphite mixxed brushes in the DC motor?   6
why d.c. supply is given to the primary side of generator?   4
 
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