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JR2, Busbar is correct. However, it is likely that using 3-phase power with a 3-phase (protected) transformer and the required cabling for 25 hp will be cheaper than purchasing, installing and configuring a converter. Do you have 3-phase power available at your location? Is it far from the 25 hp?

JR2, Each phase of 3 phase power is 120 degrees apart. you cannot make 3 phase power from a single phase without applying phase shift devices. Furthermore, keep in mind that even with phase shifting gear, you will take all the power from the single phase.

MustangDan, skogsgurra and xyzz are absolutly right, keep the logic in the PLC. Just make sure you have enough memory in the CPU to do the job. Keep in mind of future expansions, you may want to buy bigger now if you have plans, rather than change in a year. Only the text message should be...

jbartos, Thank you, but this confirms that there is no basis for the duration of the flame test. The above link mentions tests for 75 seconds, 20 minutes, 30 minutes and again 20 minutes. Nobody justifies the length of the flame duration. This is what I'm looking for. In my opinion...

Hello Everyone, Does anybody know what sets the time requirement for the 3 hour flame test of certain standards? For example a MIL-DTL-24643B requires this type of test. I'm interested what where the reasons of the 3 hours, why not 5hrs or 2hrs or other?