On Sunday, April 29, 2018 at 3:34:07 PM UTC-4, Clare Snyder wrote:
On Sun, 29 Apr 2018 10:54:41 -0400, wrote:

On Sun, 29 Apr 2018 08:43:33 -0400, Clare Snyder
wrote:


Previous to 1974 in Canada. Had pullouts in my old fuse panel -
house built in 1974. Helped my dad wire houses in the sixties and thry
were all paired then too. That was for not only single yoke but any
time the 2 circuits existed in the same box (lighting switch on one
circuit and recepotacle on the other in a ganged box, as an example -
or two lighting switches on different circuits)

How do you "pair" fuses for general lighting circuits. They are
usually screw in plug fuses. That is why the code did not require it.
Fromwhat I remember, Canadian code required separation of the
circuits UNLESS the fuses were "ganged".

In MOST cases the circuits could be easily separated, not having 2
lseparate live feeds in a single box. In situations where that was not
possible or feasible, the "ganged" fuses were required.
In actual real-world situations, it was not common to run into the
situation.

My house had a "stove block" a "drier block" plus 4 ganged fuse
pullouts - 2 for kitchen outlets, one for the AC and one for another
"edison circuit" The fuse and drier blocks had cartridge fuses - the
rest were plug fuses.

Back in the 1969 code book - section 12-296 is states "conductors of
different systems shall not be installed in the same box,, cabinet, or
auxilliary gutter unless:

1 a barier of sheet steel not less than 0.0528 inch (16msg) or ane
equivalent device of acceptable insulation material is used to devide
the space into separate compartments for the conductors of each system
- - - - - . Therer are exceptions listed


I would take that to mean "different systems", eg low voltage signaling
in the same box as 120V plus. Not different circuits of the same system.
That is where they specify a divider if you're using the same box.
An Edison circuit is actually the same branch circuit, at least I'd
consider it to be one circuit.




Also, in14-032
In branch circuits derived from a 3 wire grounded neutral systen
(Edison circuit) 2 single pole manually operable circuit breakers may
be used in lieu of a 2 pole b...