BA30H-M/Z3 REX 30KVA 480-120/208V 3PH ISO TRANSFORMER

Yes — because this is an isolation transformer with no direct electrical connection between primary and secondary windings, the 120/208V secondary constitutes a separately derived system under the Canadian Electrical Code (CEC). This means you are required to establish a new system bonding jumper and grounding electrode conductor at the secondary side. If you need guidance on grounding requirements for your installation, our specialists are happy to assist.

For continuous-duty loads, best practice is to load the transformer to no more than approximately 80% of its rated capacity — around 24 KVA — to prevent overheating and extend service life. At 120/208V three-phase, the full 30 KVA corresponds to roughly 83A per phase on the secondary. If your connected load exceeds this, we can help you evaluate a larger Rex unit or parallel configuration.

Northern Breaker Group specializes in obsolete and hard-to-find electrical equipment, including industrial transformers. Whether the BA30H-M/Z3 is a current or legacy Rex unit, we can check our existing inventory and sourcing network across our Calgary, Edmonton, and Vancouver locations. Reach out with your requirement and we'll confirm availability or identify a compatible replacement.