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| Re: NYP GAPS (Was: Re: LIRR East Side Access (256881) | |||
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Re: NYP GAPS (Was: Re: LIRR East Side Access |
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Posted by bill west on Tue May 23 07:01:25 2006, in response to Re: NYP GAPS (Was: Re: LIRR East Side Access, posted by J trainloco on Mon May 22 23:57:55 2006. If something goes wrong while unplugging a 64v 20amp control jumper, the spark is no big deal. If something goes wrong while unplugging a 750v 5000amp power jumper, the arc vaporizes everything for two feet around. Married pairs that share 750v DC have the power jumpers bolted on in junction boxes. It takes shopmen 20-40 minutes to separate the cars, the power won't still be accidently on.The GN and RDG 11kv AC power jumpers were on the roof. They were sort of miniature horizontal pantographs. No operator action was needed to connect or separate them. The New Haven E-33/EF-4 jumper was bolted up by an electrician while the power was off (pantographs down). Bill |
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