Hi Wrenches,
I went through the Siemens Web site to get answers
to the question of daisy chaining series strings of modules. It appears
that there is no fuse required between the Series sets anymore.
Below is the response from Arthur Rudin of Siemens
concerning my question.
*********************************************************************************************
Hi Drake,
Sorry for the delay in this
response. I have been travelling and did not
have access to my
e-mail. The NEC does require a fuse for each source
circuit.
Modules or strings can be wired in parallel as long as the total
short
circuit current x 1.25 does not exceed the series fuse rating of the
module. This is explained in article 690 of the NEC and the NEC
handbook.
You can check your library for this information.
Best
regards,
Arthur
*****************************************************************************************
Siemens apparently has no other requirement for
their module wiring than the NEC specifications.
So if Siemens is
going to let us meet the Code requirements for module wiring, without
using extra fuses between the series pairs, we are safe daisy chaining strings
of Siemens modules, and then going to one overcurrent device.
We can omit those pesky fuses between series
strings of modules. There is no need for multiple whips to combiner boxes,
with all the terminal strips, etc. This is the new Code, and it is a lot
easier than the last.
Drake
RE
Lab
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