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

# readAttributeRmsVoltagePhaseC(completionHandler:)

## Declaration

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

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