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Onan OTPCA Transfer Switch

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Old 03-20-2017, 08:11:15 PM
radiotech radiotech is offline
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Default Onan OTPCA Transfer Switch

Hello Everyone. I have an used OTPCA transfer switch that I am installing. This ATS has the LED Bar Meter installed. The current transformers have a long cable that plugs into a circuit board on the side wall, but I am trying to figure out how the CT's are mounted. Do they just have the power cables looped through them or are the some mounting brackets that are missing. Does anyone have experience with installing these CT's?
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Old 03-20-2017, 08:58:49 PM
MBB MBB is online now
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Default Re: Onan OTPCA Transfer Switch

Do you have the installation manual 962-0612A? If not go to twinslan site and download. Page 3-2

Picture would help. I may have misunderstood the question. Are the CT's loose?

Last edited by MBB; 03-20-2017 at 09:13:44 PM.
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Old 03-20-2017, 10:12:28 PM
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EricWood EricWood is offline
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Default Re: Onan OTPCA Transfer Switch

Yes, the CT's go on the load cables that connect on the side. Just slide them on--the load cables are a single pass straight through. Just make sure that "A" phase CT is installed on "A" phase load cable, etc. Also, make sure the CT polarity (should be a small white or black dot on the side of the CT "donut") is pointing towards the power source. [Polarity dot will face the switch mechanism once mounted on the load wire, and wire installed to switch.]
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Old 03-21-2017, 07:52:00 AM
radiotech radiotech is offline
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Default Re: Onan OTPCA Transfer Switch

Thanks for the replies. I have the installation manual. I just seems strange to me that the CT's just dangle there with the cables passing through. The older OT switches that I have installed all have a mounting bracket that support the CT's. I guess the cables won't be moving around so it will be ok.
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Old 03-21-2017, 10:33:08 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan OTPCA Transfer Switch

The mounting system disappeared years ago. Really no need for it. Since the cables never move. Just follow Eric's advice.
I don't talk to myself. This early in the morning. Why the hell should I talk to you.
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