Permutation question with Kirk Key interlocks
Permutation question with Kirk Key interlocks
(OP)
We have a UPS system involving two panelboards that have a total of 6 circuit breakers. One system feeds the other.
What I am trying to figure out is all the different combinations that these switches could possibly be in, because I want to individually analyze each case for any backfeed or safety issues.
It's not as easy as it sounds. For example SW1 on all the rest off...case 1. SW2 on, all the rest off...case 2, SW1 and SW2 on, all the rest off..case 3, etc.
Does anyone know the mathematical formula for this, that is how many possible combinations there are? Reference? It would be even better if they fit into a matrix by positions, to make sure I've got them all.
What I am trying to figure out is all the different combinations that these switches could possibly be in, because I want to individually analyze each case for any backfeed or safety issues.
It's not as easy as it sounds. For example SW1 on all the rest off...case 1. SW2 on, all the rest off...case 2, SW1 and SW2 on, all the rest off..case 3, etc.
Does anyone know the mathematical formula for this, that is how many possible combinations there are? Reference? It would be even better if they fit into a matrix by positions, to make sure I've got them all.






RE: Permutation question with Kirk Key interlocks
RE: Permutation question with Kirk Key interlocks
Alan
Democracy is two wolves and a sheep deciding what to have for dinner. Liberty is a well armed sheep!
Ben Franklin
RE: Permutation question with Kirk Key interlocks
Without knowing more about your system, I'd suggest some main breakers.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: Permutation question with Kirk Key interlocks
Realized that I mis-read you post originally...a one line would probably help.
Alan
Democracy is two wolves and a sheep deciding what to have for dinner. Liberty is a well armed sheep!
Ben Franklin
RE: Permutation question with Kirk Key interlocks
Good luck,
EEJaime
RE: Permutation question with Kirk Key interlocks
off-off, on-off, off-on, and on-on are the four possible combinations.
2^2=4. Whitey is correct.
Or try converting binary 111111 to decimal and adding 1 for the all off zero case.