diy solar

diy solar

trouble finding a 60 amp, non fusible Disconnect Safety Switch that'll accept 2 GA Wire

PoPoShoo

New Member
Joined
Feb 3, 2022
Messages
76
Most seem to have lugs that max out at accepting 3 ga wire. Is there a switch out there that will accommodate 2 gauge or can we somehow 'cheat' and make a 2 ga fit into a 3 ga. lug?
 
You can use a 100 amp disconnect and fuse reducers.
Just make sure that you are using dc rated equipment.
Assuming that this is for a dc circuit. Since the wire is so large.
And I just re read your post.
"Non fused".
Disregard
 
Most seem to have lugs that max out at accepting 3 ga wire. Is there a switch out there that will accommodate 2 gauge or can we somehow 'cheat' and make a 2 ga fit into a 3 ga. lug?
Just use a 100 amp disconnect. Unless you are tight on space.
 
This is for AC from inverter to Disconnect Switch Box. 2 gauge Alum. wire (budget constraints)

Most of the Disconnect Switches max out at accepting 2 ga. wire at the lug. Can we somehow make 2ga 'fit' into 3ga?
 
This is for AC from inverter to Disconnect Switch Box. 2 gauge Alum. wire (budget constraints)

Most of the Disconnect Switches max out at accepting 2 ga. wire at the lug. Can we somehow make 2ga 'fit' into 3ga?

Tim, our Inverter output is 47.5 amps...that wouldn't be a problem to wire to 100 amp disconnect (thought we'd need 60 amp)??
 
Depending on what disconnect you choose. Some are easy to change out the lugs.
 
Tim, our Inverter output is 47.5 amps...that wouldn't be a problem to wire to 100 amp disconnect (thought we'd need 60 amp)??
Non fused disconnects provide no overcurrent protection. It's just an on off switch. There's no issue with oversizing.
 
Most seem to have lugs that max out at accepting 3 ga wire. Is there a switch out there that will accommodate 2 gauge or can we somehow 'cheat' and make a 2 ga fit into a 3 ga. lug?
I'll let you do the in-depth homework BUT:

Siemens GNF321 or GNF322 may work for you.

I believe the lugs will accept 2 awg but do not meet NEC wire bending requirements and are not UL listed for 2 awg.
 
Most switches used in this forum are not meant to be switched under any load.

A 100 amp disconnect is a bit larger than the 60 amp version but does offer more flexibility as far as wires go.
I am using 3 Siemens GF222NA Safety Switches in my system. They allow for quick and safe disconnection, even under full loads. One unit disconnects the solar array, another disconnects Grid Power and the third disconnects the batteries from everything except for an Anderson type connector and a Class-T Fuse. My batteries live on a cart that can be pulled away from the rest of the system without touching anything but the cart.

The Siemens and the Anderson are both approved for disconnect under load. The Anderson is good for hundreds, the Siemens is good for thousands of switches under load.

There is no 60 amp choice with Anderson and most items are OUT OF STOCK, but you may be able to find similar to meet your needs.
 
well, I tell ya, it's hard to find via internet search a: 100 amp, non-fusible basic single throw safety switch. There has to be one or more out there
 
I didn't realize how rare it was. I guess that there's just no normal use for it. Might have to use fusible and throw in a couple of fuses.
 
Back
Top