Generator Interlock Kit for Murray Panels
There's no current factory interlock kit sold under the Murray name, so a generator interlock kit for a Murray panel comes from an aftermarket maker, matched by amp rating, breaker spacing and main breaker style. Several of those kits are shared with Siemens and ITE panels, because GenInterlock says Murray panels often share layouts with them.
Find the kit for your panel
What to check on a Murray panel
GenInterlock says fit depends on three things: amperage, breaker spacing and main breaker position. Interlock Technologies says the same about its kits. So before you order, get:
- Amp rating of the main breaker, printed on its handle.
- Breaker spacing, the gap between the main breaker and the breakers next to it. Measure it with a tape and write it down in fractions of an inch.
- Main style. A standard main sits at the top and switches side to side. A "hump" main is a raised main breaker that sits proud of the others, and some Murray panels use a left-hand hump.
- Panel age. One of GenInterlock's Siemens and Murray kits is listed only for panels made before March 2020.
Then take a clear photo of the open panel with the label. Interlock Technologies will match a kit from a panel photo.
Murray kits on the market
These are the types GenInterlock lists for Murray panels:
| Kit type | Rating |
|---|---|
| Siemens and Murray 100 amp panels | 100 A |
| Older Murray 100 amp panels, shown with 1/2 inch spacing | 100 A |
| Siemens and Murray 150 or 200 amp panels made before March 2020 | 150 or 200 A |
| Hump breaker replacement for Siemens, Murray and Crouse-Hinds | 150 A or 200 A versions |
| Left-hand hump breaker replacement for Murray and Crouse-Hinds | 150 A or 200 A versions |
| Outdoor meter main, single row (Siemens, ITE and Gould) | 150 to 200 A |
Interlock Technologies lists its own Murray-compatible kits too, including ones it names for Siemens, ITE and Murray panels and others for Crouse-Hinds and Murray. Hump-breaker kits replace the hump main entirely, which makes that install more involved than a plain plate.
Siemens kits and Murray panels
Siemens' own ECSBPK kits are listed by the breaker types they lock, such as QP, QPH and HQPH, not by brand name. If your Murray panel's label lists breakers that match one of those Siemens kit descriptions, ask your electrician whether the Siemens kit is listed for it. Don't assume. The panel label decides what's allowed in it.
Kit or new panel?
An interlock goes on a panel that's in good shape. If the electrician finds scorched bus bars, loose breakers, aluminum branch wiring problems or no room for a back-fed breaker, the money is better spent on a panel replacement, which can include a factory interlock kit for the new panel. A manual transfer switch is the other route when no listed kit fits.
Whatever kit you buy, make sure it's listed. Interlock Technologies says its kits are MET listed to UL standards.
The rest of the setup
Add a two-pole back-fed breaker that matches the panel's breaker type, an outdoor inlet box and a generator cord. Interlock Technologies pairs a 30 amp back-feed breaker with generators up to 8,000 watts and a 50 amp setup with larger units.
Sources
- GenInterlockMurray generator interlock kits (opens in a new tab)
- Interlock TechnologiesMurray interlock kits (filter by manufacturer) (opens in a new tab)
- Interlock TechnologiesInterlock kit FAQs (opens in a new tab)
- Siemens Industry, Inc.SPEEDFAX 2017 Product Catalog, Section 1: Load Centers and Circuit Breakers, Manual Transfer Interlock Kits (p. 1-26) (opens in a new tab)