Thanks for your help.
I have now the ANSI C84.1-1995 standard.
If i have understood that right it would mean the following:
-System voltage is the voltage a power system is designed for (usually 480 or 600VAC)
-Service voltage is the voltage i should be able to measure after transformation from...
As a european supplier we are confused with the various terms and numbers used for power supply specs in north america. Terms like nominal system voltage, nominal utilization voltage, service voltage and service&utilization voltage in relation with 460 or 480VAC, resp. 575 or 600VAC do not mean...
mc5w: that confuses me now. In which section of the NEC can i read the passus you mention? (maybe it helps to understand, that i use the transformer to step US-voltage down to european voltage of 400VAC to feed european bulit machinery)
That was refering to use 2 or more standard panelboards each on its own feeder (answer from mc5w).
Coming byck to my original request: is there a limitation in the amount of panels? (i may have the case where i need to use up to 4 panels as a multi section panel) Is that OK with the code?
I forgot to mentione that the panel(s) would be fed by a tranformer. Thats why i want to use a multi-section panel to avoid the need of more then 1 transformer.
Having more then 42 poles, i need to use Multi-Section Panelboards interconnected via Gutter Taps, Sub-Feed Lugs or Through-Feed Lugs.
1) How many panels (max) can be connected to be a Multi-Section Panel.
2) Do the panels need to be mounted each next to the other or are there gaps between...
I will get in touch with Cutler Hammer to caltify the details.
Thanks to all of you for your help. I appreciate all your effort!!!
This case is closed.
Thanks for all your answers, they are containing very helpfull informations for me. Please provide some more help for the questions below:
-i need on all loads the neutral (coming from the transformer)
-i still have a problem understanding the terminology in the NEC. My cabinet will be used to...
I have not sized the transformer yet. The 13 loads on the first circuit breaker panel would reach a total of 70kVA/102A, the 12 loads on the second circuit breaker panel bring it to 41kVA/96A. The voltage on the secondary side of the transformer is 400VAC in a 4 wire system (3phases + neutral + PE).
I have a transformer to bring the 3-phase voltage of 480VAC down to 400VAC (for feeding european equipment in the US). From the secondary side of the transformer i want to feed 25 3-phase loads (=75 poles)trough a circuit breaker panel. According to NEC408, i can handle only up to 42 poles (=14...
