Question about isolation transformer

JukeboxJon

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Need an isolation transformer for a Marvel vs Capcom im restoring it must of had a u2000 or 5000 before and didnt need one but going to use an extra hantarex polo I have working. Just a little curious about the extra markings on this one. White goes to bot "OV" and black to 115 then out the top direct to monitor white out ov black out 115 correct? What is the extra tap "E" i assume where to put the earth ground vs grounding it to the metal mounting plate for isolation transformer and it just has a build in tap? Does it even matter should I just use metal metal frame as ground anyway because it would be easier to join more earth grounds there with a bolt and nut than opposed to one tap? (Like earth ground from there to metal frame of chassis)

One other question what size of fuse should be used in between 110 coming in and isolation transformer? My thoughts were something like. 2 or 3 amp slow blow?
 

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