---
title: "readAttributeRmsVoltageMaxPhaseC(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterelectricalmeasurement/readattributermsvoltagemaxphasec(completionhandler:)"
---

# readAttributeRmsVoltageMaxPhaseC(completionHandler:)

## Declaration

```swift
func readAttributeRmsVoltageMaxPhaseC(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)
```

```swift
func readAttributeRmsVoltageMaxPhaseC() async throws -> NSNumber
```