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

# readAttributeRmsCurrentPhaseB(completionHandler:)

## Declaration

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

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