Okay, let's break down your situation and address your concerns about mixing #14 and #16 grounds using wire connectors (like "greenies").

Understanding the Issue



The Problem

The core concern is whether the listed (or rated) capacity of the wire connector you used (the "greenie") allows for a combination of #14 and #16 AWG (American Wire Gauge) ground wires. If the connector is not rated for that combination, the connection could be considered non-compliant with electrical codes. This is less about how "tight" the connection feels and more about the connector's engineered and tested capabilities.

Why it Matters

Improper wire combinations in connectors can lead to:

Reduced Grounding Effectiveness

A loose or poorly made connection can hinder the ground's ability to quickly and safely carry fault current back to the electrical panel, increasing the risk of electrical shock or fire.

Connector Failure

Over time, vibration, thermal expansion/contraction, and corrosion can loosen an undersized connection, leading to increased resistance, heat, and potential failure.

Code Violations

Electrical inspections can flag non-compliant connections, requiring rework.

Regarding Your Specific Scenario


Connector Ratings are Key

You must determine the exact model of the wire connectors ("greenies") you used and then look up their specifications. The manufacturer's documentation (often available online) will list the allowable wire combinations. It should say something like "Acceptable Wire Combinations: #18 - #10 AWG (2-#18 minimum)" or similar.2.

Most Common "Greenies"

The most common green wire connectors are typically rated for a minimum of (2) #18 AWG, up to a maximum of (3) #12 AWG. This does not allow for a #16 AWG. This is likely the issue that you are running into.3.

#16 Ground Wire in Old Cloth Romex

It is common for older cloth-insulated Romex to have a smaller (often #16) ground wire.4.

Your Wiring Practice

You stated you combined the grounds, and ran a #14 to both the box and the fixture. This is generally a good grounding practice, but the grounds must be properly connected.

Possible Solutions & Recommendations


Identify the Connector

The first step is to positively identify the exact connector you used (brand and model). The packaging or the connector itself should have markings.2.

Check the Specifications

Once you know the connector, find its specifications. The manufacturer's website is usually the best resource. Look for the "Acceptable Wire Combinations" section.3.

If the Combination is NOT Allowed



Correct the Connections

The safest and most code-compliant approach is to replace the connectors with ones that are rated for the combination of #14 and #16. There are several options:

Smaller Connectors

Some wire connectors are specifically designed for smaller wire gauges and can accept a combination of #14 and #16. Wago 221 series connectors are a good example.

Pigtailing

Use a correctly sized wire connector to connect the #16 ground to a #14 pigtail. Then, use a larger connector to combine the #14 pigtail with the other #14 grounds and the ground wire to the box.

Document Everything

Keep a record of the connectors used, their ratings, and the connections made. This can be helpful for future reference and inspections.4.

When in Doubt, Ask

If you are unsure about the correct way to make the connections, consult with a qualified electrician or electrical inspector.

Important Considerations



Local Electrical Codes

Always follow the local electrical codes and regulations. These codes may have specific requirements for grounding in older homes.

Safety First

When working with electrical wiring, always turn off the power at the breaker and verify that the circuit is de-energized before touching any wires.

Proper Tools

Use the correct tools for stripping, cutting, and connecting wires. This will help ensure a secure and reliable connection.

In summary, you need to verify the connector ratings. If your connectors are not rated for the combination of #14 and #16, you should correct the connections using appropriately rated connectors or a pigtailing method. Prioritize safety and compliance with electrical codes. Flag for review