Since there’s not a heavy load on the system at start up as compared to full
load under operation I believe the three wires and contacts are to distribute
the load under the full load in operation. I know that NEC code doesn’t apply
to wiring inside a unit but external of a unit where it does, #8 wires are not
allowed to be paralleled. I think the code allows paralleling wires, external
of units to begin at 250 or 500 mcm.
Sent from the all new AOL app for iOS
On Wednesday, March 1, 2023, 10:51 AM, Victor Rosenthal 4X6GP
<k2vco.vic@gmail.com> wrote:
I don't see the point of paralleled contactors. The critical part is
make and break, not steady state current. The danger is that contacts
will be damaged or welded together by the arc that occurs on make/break.
One of the contactors is always going to close/open before the other, so
the probability of damage is not reduced by having two. If one of them
welds itself shut (happened to me), then it doesn't matter if the other
one doesn't!
If one of these isn't big enough, then you need to replace both of them
with a bigger one.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 01/03/2023 16:08, jim.thom jim.thom@telus.net wrote:
> Here, 3 x paralleled 8 ga Teflon wires (silver plated, and stranded) are
> used to wire each side of the incoming 240 vac mains...to the pair of
> paralleled 3 pole contactors. A 3rd contactor (double pole) will be later
> installed for the HV step start. Right angle drive to be installed on the
> small 240 vac variac, through the rear panel, so fil V can be dialed in.
>
> Incoming line cord is 3 ga....and is 10' long. Other end can be trimmed off
> as required, and will be hardwired into a small 125 amp sub panel, then off
> to main panel.
>
> https://www.youtube.com/watch?v=OokpV9aEG9A
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|