240V Power Srip?
240V Power Srip?
(OP)
Our local electric supplir says ther is none such. Is this true and if so why?
By Power Strip, I mean like the device that is made for 115V service that plugs into a receptacle and has two or more female plugs usually encased in a metal or plastic enclosure. I suppose a surge protector would be a special case of a power strip.
By Power Strip, I mean like the device that is made for 115V service that plugs into a receptacle and has two or more female plugs usually encased in a metal or plastic enclosure. I suppose a surge protector would be a special case of a power strip.





RE: 240V Power Srip?
ie P--------[SSSS]
Pis the plug, S are the sockets on the other end of the lead ----.
Bung
Life is non-linear...
RE: 240V Power Srip?
The lack of 220 powerstrips here is due to the fact that virtually all our appliances work on 110-120. the few devices that use 220 generally are of such current needs that they get their own dedicated circuit, so a powerstrip would be superfluous.
Andy
RE: 240V Power Srip?
RE: 240V Power Srip?
RE: 240V Power Srip?
One motor is 2 hp and the other is 5hp but they will not be loaded to FLA and will not be necessary to start them simultaneously. I believe these are used motors that were available and don't really need this much capacity. The circuit is good for 50 amp.
I appreciate your concern, especially the comment about the switch (maybe we could use a Frankenstein switch), and will take it under advisement even though it is not my responsiblity, I will make sure that sometning dangerous is not attempted.
The third motor I have not seen but it will not be under load (possibly idling) when the two above motors are energized and this is a separate outlet and hopefully an additional circuit. I will check this.
Thank you
RE: 240V Power Srip?
RE: 240V Power Srip?
Thanks. I have copied and pasted your response in a word doc for later email to the mfg engr in charge of the project.
I looked at your profile but could not tell if you are an EE or...?
I was told by an ME that I worked for that LRA was approx 3X FLA and I believed him because he was sharp. The FLA rating of the 2 hp motor was 15A as I recall which works out to 3.33X at the NEMA listing you quoted of 50A. Where does the 6-10X factor come from?
RE: 240V Power Srip?
buzzp is right on the mark with LRC being 6-10x FLC. The exact value is dependent on the design of the motor's magnetic circuit. There is a fair bit of variation depending on what the goal of the designer was: high pull-out torque, high efficiency, low starting current, etc.
----------------------------------
If we learn from our mistakes,
I'm getting a great education!
RE: 240V Power Srip?
Bung
Life is non-linear...
RE: 240V Power Srip?
"Venditori de oleum-vipera non vigere excordis populi"
RE: 240V Power Srip?
I show full load amps of a 2HP, 230V squirrel cage motor to be 6.8A with locked rotor current (max) of 50A.
The 5HP 230V shows full load amps of 15.2A with locked rotor current of 92A. So these are roughly 6X the full load current. Looks like you confused the 2HP and 5HP.
Now I am sure your ME boss is sharp but if your motors are designed aroung NEMA and are squirrel cage induction motors then the numbers I give you are correct but are the maximum numbers.