CTs & Rogowski-Coils for Auditors

For installers: A summary of Current Transformer (CT's) and R-Coil specifications for all Wattwatchers Auditors

The Current Transformers (CTs), Rogowski Coils (R-Coils) and Billing CTs required by Wattwatchers for Auditors and A6M+One packages are sold by us in sets of three in the following ratings:

CTs for use with Wattwatchers Auditor A6M devices

Rogowski Coils for use with Wattwatchers A3RM devices

Billing CTs for use with CET PMC 340-BB Meter

Specification files

Warning: Third-party CT's to an Auditor can cause inaccurate readings and damage the hardware. The Warranty of an Auditor is void if third-party CTs, or CTs of the incorrect specification, are fitted to an Auditor.

60A CTs

Use with: Auditor 6M & 6W

Max Current: 60A

Accuracy Class: 1.0

Type: Split-Core

Internal opening diameter: 10mm

External dimensions: 25x40x23mm

Cable: 1.8m (UL21885 24AWG*2C OD:3.6 grey jacket PVC wire)

120A CTs

Use with: Auditor 6M & 6W

Max Current: 120A

Accuracy Class: 0.5

Type: Split-Core

Internal opening diameter: 16mm

External dimensions: 40x45x30mm

Cable: 1.8m (UL21885 24AWG*2C OD:3.6 grey jacket PVC wire)

200A CTs

Use with: Auditor 6M & 6W

Max Current: 200A

Accuracy Class: 0.5

Type: Split-Core

Internal opening diameter: 24mm

Cable: 3.0m (UL21885 24AWG*2C OD:3.6 grey jacket PVC wire)

400A CTs

Use with: Auditor 6M & 6W

Max Current: 400A

Accuracy Class: 0.5

Type: Split-Core

Internal opening diameter: 25mm

Cable: 3.0m (UL21885 24AWG*2C OD:3.6 grey jacket PVC wire)

600A CTs

Use with: Auditor 6M & 6W

Max Current: 600A

Accuracy Class: 0.5

Type: Split-Core

Internal opening diameter: 36mm

External dimensions: 48x80x60mm

Cable: 3.0m (UL21885 24AWG*2C OD:3.6 grey jacket PVC wire)

3,000A Rogowski Coils (3RM Compatible Only)

Use with: Auditor 3RM

Max Current: 3,000A

Sizes Include: 90mm, 200mm and 290mm

(Sizes are internal diameter)

Accuracy Class: Accuracy: Class 1-A1 according to IEC 61869-10

Type: Split-Core

Cable Type: 3.0m - black polyurethane UL94-V0

Cable Size: Two Core and shield @ 22 AWG (0.327mm2) 

Cable Extension: Can be extended up to 10 meters 

Minimum Accuracy: Down to 20A, the accuracy of Rogowski coils is within 1%. Below 20A it grows to 1.5% down to 5A.

Specifications: Rogowski specs

600A Billing CTs

600-1500A/5A Yellow Billing CTs

Use with: Auditor 6M+One and fit to CET PMC-340BB

Max Current: 600A

Accuracy Class: 0.5

Type: Split-Core

Internal opening diameter: 36mm

External dimensions: 38.4 x 57.0 x 81.5 (mm)

Cable: 3.0m - UL21885 2 x 16AWG  - grey jacket PVC wire

 

Warning: Fitting billing CT's to an Auditor will damage it and void warranty. Only use Billing CTs with PMC Meters. Billing CTs have a potential of 5A on the open ends.

1500A Billing CTs 600-1500A/5A Yellow Billing CTs

Use with: Auditor 6M+One and fit to CET PMC-340BB

Max Current: 1500A

Accuracy Class: 0.5

Type: Split-Core

Internal opening diameter: 80mm

External dimensions: 28.0 x 140.0 x 180.4 (mm)

Cable: 3.0m - UL1015 2 x 16AWG  - grey jacket PVC wire

Warning: Fitting billing CT's to an Auditor will damage it and void warranty. Only use Billing CTs with PMC Meters. Billing CTs have a potential of 5A on the open ends.

Downloads

📎 600V (Grey) CT and Rogowski Specifications 2024 (Current)

📎 300V (White) CTs Specifications Legacy (For older CTs no longer in use)

📎 CT sizing based on common cable sizes

 

Looking to find out about extending cables? See our article Can Current Transformer and Rogowski Coil cables be extended