minimum conductor size that can be run in parallel
minimum conductor size that can be run in parallel
(OP)
what is reason for minimum conductor size that can be run in parallel (other than economic and labour intensity). I am working to marine/offshore rules that state minimum c.s.a that it is permitted to start running conductors in parallel is >10mm.sq.
someone asked me if they could run 2 x 1mm.sq cables instead of 1 x 1.5mm.sq.
someone asked me if they could run 2 x 1mm.sq cables instead of 1 x 1.5mm.sq.






RE: minimum conductor size that can be run in parallel
In the US the minimum size is #1/0 AWG, although it normally is not done until maybe #4/0 or so.
RE: minimum conductor size that can be run in parallel
I had read something similar.... http://www.ecmag.com/section/systems/conductors-co...
I wouldn't really think at starting to run parallel below 50 or 70mm.sq (which is similar to the 1/0 awg you quote). I could only think maybe manufacturer tolerance in resistance/reactance (proportionality relative to conductor size) would be a contributing factor, but wanted some other view before giving an answer to my colleague other than just quoting a rule that he shouldn't do it.
RE: minimum conductor size that can be run in parallel
RE: minimum conductor size that can be run in parallel
Ungrounded and grounded circuit conductors of similar conductivity in sizes No. 1/0 AWG and larger,
copper or aluminum, shall be permitted to be installed in parallel sets provided that each parallel phase or
grounded conductor set is individually comprised of conductors that are
(a) free of splices throughout the total length;
(b) the same circular mil area;
(c) the same type of insulation;
(d) terminated in the same manner;
(e) the same conductor material; and
(f) the same length.
......................
(5) Conductors of similar conductivity in sizes smaller than No. 1/0 AWG copper shall be permitted in parallel
to supply control power to indicating instruments and devices, contactors, relays, solenoids, and similar
control devices, provided that
(a) they are contained within one cable;
(b) the ampacity of each individual conductor is sufficient to carry the entire load current shared by the
parallel conductors; and
(c) the overcurrent protection is such that the ampacity of each individual conductor will not be
exceeded if one or more of the parallel conductors becomes inadvertently disconnected.
Bill
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"Why not the best?"
Jimmy Carter
RE: minimum conductor size that can be run in parallel