Grip vs Electrical Dept.

 A gaffer is practically the head electrician of any set if as anything to do with the light or just power in general that is the gaffer in the film department. Not only with lights but things like Bates cables distro boxes cam-locks, generators  if it is an electrical pulse it starts with the an interesting vision in their mind. Photography or cinematographer translate the vision the direct has into a physical reality the DP or cinematographer then communicates with the key grip and gaffer will do some electrical math then relay the information from the DP to their right hand man. The differences are that grip are more in charge of playing the construction role whereas electrical is more of the technician and they fix things. 

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