The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Topic Options
Rate This Topic
#82217 - 10/24/02 04:01 PM Parallel Circuits
chick Offline
Junior Member
Registered: 10/24/02
Posts: 3
Loc: louisville, kentucky
i found this question being asked on a group bulletin is the initial question:

Just a quick question for the electricians amongst you......

Often when I am wiring Low Voltage and High Current circuits, I
will 'double-up' cables. By this I mean that instead of using 1
length of 10mm squared cable, I will use 2 lengths of 6mm squared
cable wired in parallel. By doing this, the cabling is much easier to
work with and is probably a little cheaper. Whilst this method is
fine for my R & D, I am unsure whether this is standard practice or
is acceptable at all.
I have quickly skimmed through some electrical practice books, but I
can't find any reference to it. It might be illegal for all I know.

Please can you advise?
Does anybody else use this method?

here is a reply from another visitor to the same group..
reply #1
Well, I'm not an electrician and I'm not really able to interpret the code
for you but my initial reaction was 'probably not permitted'. I only have a
copy of the 1996 code, which is superseded, but section 310-4 allows
conductors in parallel for general wiring under certain conditions but
meeting ampacity through aggregation as you describe isn't permitted
(although for some reason 620-12a appears to allow this for lighting
circuits). There are other sections that reference conductors in parallel but
these seem to be the salient sections.

There are a lot of books on "practical electrical wiring" but the text by
that title by H. P. Richter is almost a standard and does address this
subject. I'd suggest picking up a copy and a copy of the code for reference.
I'm no expert and while wiring isn't 'rocket science' in most cases, in some
cases its worse - sneaky little electrons and fields...

reply# 2:

Tell this to the Long Island Power Authority for their plans to lay the 1300 mm squared DC power cables across the LI Sound to Connecticut. See: .

SOME COMPANY has long been a fan of laying underground power cable. Do it right but do it. It is called "Instant Power Company". Communities wanting renewable energy need only someone to lay cable and be the "battery" for everyone. an organisation should be more attuned to these needs than they seem to be. It is a double burden for everyone to both generate their own energy *and* store it.


i was just wondering if anybody here has any comments on this topic?



[This message has been edited by chick (edited 10-24-2002).]
2017 / 2014 NEC & Related Books and Study Guides


2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Recent Posts
Forum Styles
by Admin
Today at 02:08 AM
License exam
Yesterday at 09:16 PM
Looking for older post
by sparkyinak
Yesterday at 12:27 AM
Members: Non-Members: Did you know?
by Admin
01/22/17 02:34 PM
Safety at heights?
by HotLine1
01/21/17 08:51 PM

Who's Online
0 registered (), 59 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
Desk-mounted "power-board"
Top Posters
gfretwell 9066
Trumpy 8560
pauluk 7693
HotLine1 6833
sparky 5545
Member Spotlight
Member Since: 11/11/05
Posts: 190

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals