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That's right PRC, however I feel if they are going to be subjected to switching surges.. then more relevant is switching impulse test rather than Lightning impulse test. Thanks..

Thanks a lot prc & Dtr2011 for the above replies... however my question is more in regards to applicability of impulse testing on indoor transformer. The insulation strength is already getting tested by applied voltages test and induced voltages at rated frequency and twice the frequency...

can anybody guide on applicability of lightning impulse test on hermetically sealed oil filled power transformer meant for indoor installation with plugin termination for hv connections. regards jay

hi Thanks Preben also API RP 14 F states the same about the lighting. however as you have indicated that in north sea that there is a practice of installing only the service light. does that imply that there is no mandatory requirements for lighting for NUI ? regards

Hi, In an offshore normally unmanned installation is it mandatory to provide a task lighting and escape lighting or is it ok to provide only escape lighting. Any code reference for the above will be appreciated. regards

hi Preben thanks alot for the quick reply on the above query. regards jay

Hi, On a fixed offshore oil & gas structure which is completely metallic, Is there any need for a common bonding network, if each equipment is bonded to the metallic structure by cad weld. Thanks in advance. Regards Jay