Obsolete, partly-abandoned fuse panel, la Fabrica Aurora, San Miguel de Allende, Mexico (C) Daniel Friedman Electrical Panel / Load Center Age
Electrical Panel Age Decoders

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Electrical Panel Age:

How to determine the age of a residential electrical service panel by noting information on its data tag and serial number (if present).

We give load center age decoders for various popular electrical panels and load centers including Square D and GE and we refer to additional articles that can help determine the age of an electrical panel by noting clues giving the age of the building and its electrical wiring or other components.

This article series includes links to other methods to determine the age of a building or this equipment and it explains how to estimate the electrical service size, ampacity rating, (or "electrical power" or "service amps") at a building by visual examination of the electrical service panel, main switch, and other details.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

In this article series we describe how to recognize different vintages, ages, types of electrical panels and how to find the components that define the ampacity rating of the service equipment.

Determine the Electric Service Panel Ampacity, Age & Type by Visual Inspection

Square D safety switch data tag example of panel or equipment age decoding (C) InspectApedia.comWe look for an electrical panel brand, model & data tag (usually paper) or embossed rating (on fuse pull outs) on the panel itself which often includes the amperage rating of the panel.

Watch out: opening or removing the cover from an electrical panel is dangerous: do not touch wires or components inside of an electrical panel or load center without proper training and protective measures. You could be shocked or killed.

For example, home inspectors or electrical inspectors who touch electrical wires or move them in order to better read the data tag are performing a dangerous act.

This information is usually present in newer panels on a panel side, or on the panel cover.

This data tag or one of multiple tags usually found inside the elctrical panel door or cover but sometimes also found inside the electrical panel enclosure itself, perhaps on the interior surface of a the load center or panel side typically provides several categories of information including

Electrical Panel / Load Center Age Determination from Serial Number

The electrical panel serial number or load center serial number, if present, can usually be de-coded to indicate the month and year of manufacture of the electrical panel, using a panel age decoding scheme that varies by manufacturer.

Here are some panel or load center age decoders for popular electrical panel brands. Contact us (page top or bottom CONTACT link) if you can provide additional electric panel age decoders.

Federal Pacific Electric Panel Age for FPE Stab-Lok equipment, Federal Pioneer &c.

FPE electrical equipment has been sold in North America from the late 1940's to the present if we include the continued sale of Federal Pioneer brand panels in Canada and "replacement" FPE type circuit breakers by some independent suppliers.

Watch out: These panels, including their currently-sold versions and replacement breakers do not meet the safety and performance of most electrical panels sold under most other brands. See FPE Stab-Lok® : FIRES WAITING TO HAPPEN

FPE STAB-LOK HISTORY - History of Federal Pacific Electric Stab-Lok® ® Electrical Panels & CIrcuit Breakers - 1950 to present

FPE - FEDERAL PACIFIC STAB-LOK ELECTRIC PANELS discusses these latent safety hazards in homes and provides a very detailed history of this product

General Electric Panel & Appliance Age Decoder, also for RCA & Hotpoint Appliance Age Decoding

GE appliance tag provides age decoding (C) InspectApedia.comIF your U.S.-made electrical panel data tags include a GE serial number (as do GE appliances), then you can translate a GE serial number to month and year of manufacture using the following procedure followed by GE based on a twelve-year cycle.

The GE data tag shown here is for a refrigerator, not an electrical panel.

The ZR in the serial number decodes to December, 2008.

GE serial number: first alphabetic character = month of manufacture, in this order:

A - January, D - February, F - March, G - April, H - May, L - June, M - July, R - August, S - September, T - October, V - November, Z - December

GE serial number: second alphabetic character = year of manufacture, in this order

G = 1980, 1992, 2004, 2016

H = 1981, 1993, 2005, 2017

L = 1982, 1994, 2006

M = 1983, 1995, 2007

R = 1984, 1996, 2008

S = 1985, 1997, 2009

T = 1986, 1998, 2010

V = 1987, 1999, 2011

Z = 1988, 2000, 2012

A = 1989, 2001, 2013

D = 1990, 2002, 2014

GE circuit breakers from a 1936 home, Raleigh NC (C) Steve Smallman

Photo: General Electric GE circuit breaker switches in a 1936 home, compliments of Raleigh home inspector Steve Smallman. Mr. Smallman's contact information is at REFERENCES.

Square D Electrical Component Age Decoder

SQUARE D ELECTRIC PANEL AGE DECODER [PDF] Date Code System for Square D Class 110 electrical panels.

The company provides multiple date code systems published in 1992 and used depending on when the electrical panel was produced. Retrieved 2017/10/21, original source, Schneider Electric at Electrical Distribution/Combination Service Entrance Devices/0110PD9201.pdf

There is a pre-1950 date code system, a 1950-1955 date code system, and a 1956 and later date code system.

Example: for a Square D product containing the date code HA065 and estimated (perhaps based on building age) as between 1950 and 1955, the date code translates into Month, Year and Operator Number as H = August, A = 1953 and Operator No. 065.

All of these decode alphabetic and numeric date codes providing detail for later electrical panels that adds to day, month, year of electrical load center manufacture also the operater number and shift.

The Square D Safety Switch label shown above provides an example of this date code system, where H25W0652 decodes to Month, Day of Month, Year, Operator Number & Shift according to a table given in this PDF file.

Zinsco Electrical Panel Age

Zinsco electrical equipment was sold in the U.S. from 1935 to 1984.


Watch out: These panels, including their currently-sold versions and replacement breakers do not meet the safety and performance of most electrical panels sold under most other brands.

See ZINSCO SAFETY PRECAUTIONS GTE Sylvania Zinsco Electrical Panel Safety Precautions for Homeowners and Home Buyers

ZINSCO/SYLVANIA ELECTRICAL PANELS discusses these latent safety hazards in homes.


Continue reading at ELECTRIC PANEL AMPACITY where we include identification images for older types & sizes of load centers & electrical panels, or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.


Or see this

Article Series Contents on Old House Electrical Components

Suggested citation for this web page

ELECTRICAL PANEL AGE at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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