AC normal range
Below 104V or above 132V: disconnectKnow the grid
before you plug in.
Practical checks, clear readings, and honest explanations for the campground power that reaches your RV.

The RVer's Complete
Shore Power Safety Guide.
A start-to-finish guide to campground electrical systems, the nine threats to RV appliances, and the checks to make before every connection.
Six checks.
One safer start.
Do these before turning on a campground pedestal. If anything looks wrong, stop and ask the campground to inspect the site.
- 01
Breaker off
Pedestal breaker off before connecting your RV power cord.
- 02
Look at the receptacle
Do not connect if there is corrosion, moisture, melting, or physical damage.
- 03
Confirm voltage
Power up and confirm the display is within the normal 108–132V AC range.
- 04
Read the status
Do not energize the RV with a fault code present.
- 05
Verify frequency
Standard shore power: 58–62Hz normal.
- 06
Start the A/C carefully
After A/C delay completes, run the A/C and confirm normal amperage.
Normal Operating Ranges.
At a glance.
RVShield disconnects output if a monitored condition moves outside its protection threshold.
Standard shore power
Below 52Hz or above 69Hz: disconnectContinuous load
Above 30A for 3 seconds: disconnectInternal thermal limit
Automatic safety shutoff at thresholdKeep learning.
Keep protecting.
Priority guides from the original library. Published pages link through; the rest remain clearly marked while they are being prepared.
RV Shore Power 101
What every camper should know about the TT-30 connection and campground power.
Article in preparationHow surge protectors work — and where they stop
Surge absorption, source monitoring, and automatic disconnection explained.
Article in preparationWhy a green light may not mean safe power
Some hazards appear only after loads are running.
Article in preparationCold Weather RVing
Plan safer hookups for changing campground conditions throughout the year.
Article in preparationA/C compressor delay explained
Why 0, 30, or 180 seconds matters after an outage.
Open A/C delay guide →kWh monitoring in an RV
Use live watts and accumulated energy to understand campsite loads.
Article in preparationEvery code has a next action.
Use the reference below for E0–E8 and Err0.
Open quick reference →When the display
has something to say.
Do not treat a code as a generic warning. It describes the condition RVShield detected and gives you a safer next action.

| Code | Meaning | Immediate action |
|---|---|---|
| E0 | Reverse polarity | Do not use the pedestal. |
| E1 | Ground fault / leakage | Disconnect loads and inspect RV wiring. |
| E2 | High voltage | Wait for stable, safe voltage. |
| E3 | Low voltage | Reduce load or change pedestal. |
| E4 | Over current | Reduce total load below 30A. |
| E5 | Over temperature | Reduce load and allow the unit to cool. |
| E6 | Open ground | Do not use the pedestal; report it. |
| E7 | Low frequency | Disconnect from the unstable source. |
| E8 | High frequency | Disconnect from the non-standard source. |
| Err0 | Internal fault | Power cycle; contact support if it persists. |
The RV Electrical
Safety Guide
The practical guide RVers wish they had before their first campground hookup—real electrical threats, plain English, and checklists you can use at the pedestal.
- Campsite hookup checklist — what to check before you plug in
- How to spot reverse polarity, open ground, and open neutral
- When to immediately unplug and walk away — no exceptions
- The 5 silent threats that can damage RV appliances
- Generator hookup safety — boondocking vs. campground protocols
- The 5 Campground Electrical Threats
- Pre-Hookup Inspection Checklist
- Reverse Polarity: How to Spot It
- When to Walk Away (and Why)
- AC Compressor Care: The $2,000 Mistake
- Boondocking Power Safety