How to do a basic Sub Meter Installation safety check and quick fixes

Quick answer (read this first)

• Turn off main power at the circuit breaker before any inspection.
• Visually check for loose wires, burn marks, or unusual sounds.
• Carefully tighten any visible loose electrical connections.
• Keep the sub meter area clean and free of dust.
• For any complex problems or persistent issues, contact a qualified electrician.

Safety first

• Always switch off the main circuit breaker before starting any work on electrical components.
• Never touch exposed wires or damaged insulation; this is a serious shock hazard.
• Use only insulated tools rated for electrical work to prevent accidental shocks.
• Wear appropriate personal protective equipment (PPE), including safety gloves and glasses.
• Ensure your workspace, hands, and tools are completely dry to avoid electrocution.
• If you are unsure or uncomfortable at any point, stop immediately and call a professional.

Tools you may need

• Insulated screwdriver set (flathead and Phillips)
• Flashlight or headlamp
• Dry cloth or soft brush for cleaning
• Safety gloves and glasses

Step-by-step

Step 1

Prioritize Safety: Turn Off Power. Before touching any electrical components, locate the main circuit breaker controlling the sub meter and switch it completely OFF. Verify power is off by trying to use appliances connected to it.

Step 2

Visual Inspection for Damage. Carefully examine the sub meter’s casing, wiring, and surrounding areas. Look for any visible signs of physical damage, frayed insulation, exposed wires, or melted plastic.

Step 3

Check for Overheating Signs. Inspect connections and the meter body for discoloration, burn marks, or any other signs of overheating. Also, note any lingering burning smells, which indicate a serious issue.

Step 4

Test for Loose Connections. Gently (without excessive force) check the tightness of all accessible screw terminals on the sub meter and any adjacent junction boxes. Use an insulated screwdriver to carefully tighten any connections that feel loose.

Step 5

Clean the Sub Meter Area. Using a dry, soft cloth or brush, gently remove any dust, cobwebs, or debris accumulated on and around the sub meter and its wiring. Ensure good ventilation.

Step 6

Restore Power and Monitor. Once you’ve completed your inspection and any minor tightening/cleaning, switch the main circuit breaker back ON. Observe the sub meter for a few minutes for any unusual sounds, smells, or flickering lights.

Step 7

Identify Persistent Issues. If you notice any unusual activity after restoring power, or if the initial visual inspection revealed serious damage, do not attempt further fixes. This indicates a deeper problem requiring professional attention.

Common mistakes

• Failing to confirm the power is off after flipping the breaker.
• Attempting repairs on damaged wires or components instead of calling a professional.
• Over-tightening or stripping screw terminals when making connections.
• Working in damp or wet conditions, increasing shock risk.
• Underestimating the severity of minor issues, which can escalate into major hazards.

When to call a professional

• You observe sparks, smoke, or a persistent burning smell from the meter or wiring.
• There are severely frayed, exposed, or melted wires.
• Your circuit breakers trip frequently, especially without an apparent cause.
• The sub meter itself is physically damaged, has a cracked casing, or is displaying incorrect readings.
• You find any issue that appears complex or is beyond a basic visual check and minor tightening.
• You feel uncomfortable, unsure, or lack the necessary expertise to safely proceed with any step.