Generator interlock vs manual transfer switch panel

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bluecollar84

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I got a 30 amp generator . What’s the difference if I install it to back feed my entire panel with the proper interlock switch then I’ll select what circuits I want on durning a power outage . Or install a 6-10 circuit transfer switch panel board and wire over preselected circuits during the install . What’s the advances to go with one of my options or the other ? Is one better than the other and are they both legal to do ?


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We do the interlock kits all the time. I prefer them because you don't need to predict how the homeowner will use the power in the future. We just stress to them that the onus is on them to manage the load on the generator. Frankly of all the interlocks we've setup I've never heard of someone tripping a breaker. I guess it should be said that I'm in the Seattle area and most of the heating loads are natural gas.

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IMO the interlock setup is better because of the flexibility. Does require that the homeowner be a little more savvy when it comes to choosing which circuits to energize.
 
infinity said:
IMO the interlock setup is better because of the flexibility. Does require that the homeowner be a little more savvy when it comes to choosing which circuits to energize.
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Also a lot cheaper than one of those 6 circuit transfer panels.
Although some of those interlock kits are not UL listed.
I have never really looked at any of the transfer panels for a UL label.
 
I agree with the interlock kit scenario. If you choose the transfer panel then you are locked into those X amount of circuits to run on the generator. If you install the interlock kit for a customer you'll have to train them so that they know they are responsible for managing their own loads. The best way to do that (I found) is to have them shut off all the branch circuit breakers in a power outage situation and then make the transfer. That way, they can turn on one breaker at a time to make sure the generator doesn't crap out. If they're real "Rubes" then install the 6 circuit Reliance panel.

Also, BTW, make sure you use an interlock kit listed for use with the breaker panel if you're getting it inspected. Seems kind of sad that many EI's will not accept the kits designed by www.interlockkit.com . They did a lot of research on various panels (many that are out of date) and they work fine.
 
journeyman0217 said:
i'm a little confused on article 110.3 b, does equipment have to have a UL listing....is installing a non UL listed interlock a code violation?
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Since this transfer equipment requires field modification of the panel I would think that the required listing also has something to do with the panel.
 
infinity said:
Since this transfer equipment requires field modification of the panel I would think that the required listing also has something to do with the panel.
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I disagree with you there.
The individual-circuit transfer panel involves rewiring the wires connected to the load terminals of the involved breakers, but does not constitute a modification of the original panel. At most it would be using the panel in a way not explicitly described in the instructions.
The interlock, on the other hand, does require a physical modification of the panel (attaching the interlock hardware to it.)
 
GoldDigger said:
I disagree with you there.
The individual-circuit transfer panel involves rewiring the wires connected to the load terminals of the involved breakers, but does not constitute a modification of the original panel. At most it would be using the panel in a way not explicitly described in the instructions.
The interlock, on the other hand, does require a physical modification of the panel (attaching the interlock hardware to it.)
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Many of kits require that the panel cover/trim be drilled and that the interlock gets screwed directly to it. Also a hold down kit is installed to keep the back-fed CB in place. Sounds like field modification to me. :)
 
My whole post was botched...SMH. I'm an Electrician. Looking for a panel for a panel for house I'm trying to buy, One with the Interlock and space expand. The owner is going to replace it, trying to suggest it for the contractor.
ptonsparky said:
You didn’t ask anything, but the advice is “Find a licensed qualified electrical contractor in your area. Ask them.”
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Teegarden76 said:
My whole post was botched...SMH. I'm an Electrician. Looking for a panel for a panel for house I'm trying to buy, One with the Interlock and space expand. The owner is going to replace it, trying to suggest it for the contractor.

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Click to expand...

I don't know who all makes them but some mfgrs. make a panel with the interlock already installed.
 
Interlock provides more flexibility, as noted above.

However, depending on the size/setup, a TF can be easier operationally if you can work out the needed circuits.

I have an all electric house with two panels. That's 33 breakers. It's a LOT easier for me to click 3 or 4 on the TF panel than to pop 29 or 30 OFF on the main panel. And when power is restored, I don't have to pop 'em all back.

I also have an inverter that runs four "critical" circuits (Sump, Garage door, CPAP, Internet). I can run these even when POCO is up and running. If storms are about, I can switch for contingency purposes. For example, if power might be lost at night, I just run the bedroom off the inverter. If the power is lost, the CPAP just churns happily along like nothing happened.

Out of house on a stormy evening? Just toggle the sump and garage door. Power goes out? Garage door works. Sump pump works.

Again, each situation is different. And most require some kind of trade-off.
 
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