VDE-AR-N 4100: Key Changes for Meter Cabinet and Service Connection
The VDE-AR-N 4100 replaced the old TAB recommendations in 2019 and applies nationwide. It regulates meter cabinet, main line and registration of consumers and generators. This overview shows what has specifically changed for electricians and homeowners.
What VDE-AR-N 4100 covers
From house connection to registration — the application rule covers the entire interface between grid and house installation.
Service connection
Connection capacity, house service box, cable entry.
Meter cabinet
Layout, minimum dimensions, reserve positions, eHZ integration.
Registration-required consumers
Wallbox, heat pump, AC, sauna from certain capacity.
Generating systems
PV, CHP, battery storage — registration also per VDE-AR-N 4105.
Key changes vs. TAB 2007
APZ is mandatory
Future connection point: an additional reserve position with fixed size for future expansion such as wallbox or PV converter.
Minimum width 1.10 m
The meter cabinet for a single-family home must be at least 1.10 m wide. Smaller cabinets are rejected by the grid operator.
eHZ standard
Pluggable meters with eHZ adapter are the rule today. Components such as load-break terminals are required.
Communication technology
Preparation for Smart Meter Gateway (SMGW) in the meter location — even if no smart metering system is currently installed.
Meter cabinet requirements in detail
Electricians and homeowners must know these dimensions.
| Parameter | Minimum | Note |
|---|---|---|
| Minimum width SFH | 1.10 m | 3-field cabinet |
| Inner height | 1,050 mm | Installation height |
| Reserve fields | ≥ 1 field | For future consumers |
| APZ | Mandatory | Future connection point |
| SMGW space | prepared | Gateway preparation |
Registration thresholds for consumers and generators
These limits decide whether a consumer or generator only needs to be reported or requires formal approval.
Wallbox
Up to 11 kW notification-required, from 12 kW approval-required.
Heat pump
Notification to grid operator. For controllable consumers (§14a EnWG) additional requirements.
PV system
Up to 30 kWp usually notification-required. Registration via VDE-AR-N 4105.
Battery storage
Registration required per VDE-AR-N 4105. Larger storage requires formal approval.
Practical tips
Generous reserve positions
Always plan 1-2 additional reserve fields. Wallbox and PV often come years later.
Position APZ correctly
The APZ must be accessible from above and must not be blocked. Document the position clearly.
Early coordination
Some grid operators have additional requirements beyond VDE-AR-N 4100. Ask the grid operator before purchasing the cabinet.
Conclusion: uniform rules, but local specifics
VDE-AR-N 4100 brings nationwide uniformity — good for planners. Still, there are local variations. Anyone planning with a large cabinet plus APZ is on the safe side everywhere.
💡 Tip: Download VDE-AR-N 4100 in its original wording — online summaries often omit critical details.
Plan meter cabinet per VDE-AR-N 4100
myElectricPlan supports VDE-AR-N 4100 directly in the switchgear editor: APZ, reserve fields and SMGW preparation are accounted for automatically.
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