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 Topic Title: What does "450/750V" on a cable REALLY stands for? Topic Summary: Created On: 24 September 2011 11:37 AM Status: Read Only Linear : Threading : Single : Branch
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 24 September 2011 11:37 AM hidex1213 Posts: 6 Joined: 24 September 2011 Hey guys. Please allow me to be honest first - I do not have any engineering background at all (tho I graduated with a biochem degree, that's very different) and found myself working in a electrical supplies company now. I've been trying to look up the meaning of "450/750V" or "0.6/1kV" (ie. U0/U, according to some articles) on the cables that I sell (obviously we sell LV electrical products) but I've been given various answers... Some say that the U0 is the VDC rating while U is the VAC rating; while the others say U0 being the operational (or "regular", I guess?) rating and the U being the peak rating. Would anybody here please verify this for me? I know it's probably a really obvious question but it's been bothering me quite some time... Please help if you don't mind. 24 September 2011 05:01 PM OMS Posts: 20641 Joined: 23 March 2004 Voltage to earth rating and voltage between phases rating Regards OMS ------------------------- Let the wind blow you, across a big floor. 26 September 2011 01:56 AM hidex1213 Posts: 6 Joined: 24 September 2011 Thank you! But there always seems to be a "magic" factor of 0.6 between U0 and U (300/500V; 450/750V; 0.6/1kV...) so my follow up questions are... Why 0.6? What causes the discrepancy between U0 and U? What about for a single phase power? would U0 = U? 26 September 2011 10:40 AM OMS Posts: 20641 Joined: 23 March 2004 The factor is actually derived from Square root of 3 ie 1.73 which is the relationship between U - line voltage and Uo - line voltage to earth So for a common 3 phase system you have: 400/230 = 1.73 and 1000V /1.73 = 600V (approx) giving you the classic 0.6/1kV cable rating. Regards OMS ------------------------- Let the wind blow you, across a big floor. 29 September 2011 07:41 AM hidex1213 Posts: 6 Joined: 24 September 2011 Thanks！ I'll now go and google up what's line voltage and line-earth voltage. Thank you!
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