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  • Users: Chiefgrunt
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  1. Chiefgrunt

    ABB HPA SF6 Circuit breakers

    Can anyone help me out with a internal circuit diagram for ABB HPA circuit breakers. I'm not having much joy from ABB or its website on this one. Your help would be much appreciated
  2. Chiefgrunt

    CT mag curve testing

    Can someone explain to me the importance of CT mag curve testing. I'm currently working on a job where the commisioning engineer is carrying out these tests on a new installation and I'm a little confused as to why!!

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