IEEE C62.42-1992

C62.42-1992 is a technical standard for voltage surge protective devices rated at equal to or less than 1000 V rms or 1200 V dc. It addresses how these devices are considered in low-voltage power, energy, and industrial applications, where transient overvoltage protection can affect equipment reliability and system continuity. For engineers, specifiers, and purchasers, the document helps define a common basis for selection, design, and evaluation.

Overview of C62.42-1992

This standard focuses on surge protective devices used on electrical systems within the stated voltage limits, making it relevant to installations where transient suppression is needed to protect connected equipment. C62.42-1992 provides a technical framework for understanding the device category in relation to power-system conditions, performance expectations, and application limits. In practice, it supports more consistent engineering decisions by aligning product characteristics with the operating environment and the protection task.

Typical use cases

C62.42-1992 is commonly relevant in low-voltage distribution panels, industrial control cabinets, and equipment interfaces where surge protective devices are used to reduce the impact of voltage transients. It may also apply to electrical assemblies serving process equipment, facility power systems, and sensitive loads that require protection from overvoltage events. The standard is useful when comparing device suitability for a particular circuit rating, service condition, or installation approach.

Why it matters

Using a defined standard for surge protective devices helps improve consistency in specification, procurement, and testing. For organizations working with electrical protection equipment, C62.42-1992 can support clearer compliance reviews and reduce ambiguity when selecting devices for a given voltage class. It also helps align expectations around protection performance, which can lower the risk of equipment damage, downtime, and mismatched product selection in power and industrial settings.

• Voltage range up to 1000 V rms or 1200 V dc
• Surge protective device application
• Low-voltage power and industrial context
• Useful for specification and evaluation
• Superseded standard reference