Code Change Summary: Requirements for barriers now apply to service panelboards.

Most electrician understand that turning off the main breaker in a service panel just shuts off the power to the panelboard but the line terminals of the main breaker are still energized. Running a fish tape down into the top of the service panelboard can be dangerous even when the main breaker has been shut off.

Requirements already existed in the NEC^® to have barriers in place for service switchboards and switchgear so that no uninsulated, ungrounded service busbar or service terminal could be exposed to inadvertent contact by persons or maintenance equipment while servicing load terminations. Now, that same requirement has been expanded to include service panelboards.

The same hazard exists whether servicing a service switchboard, switchgear or a service panelboard. Even when the main breaker is off, the line terminals of the breaker are still live and need to be avoided at all costs.

UL 67 is the standard for panelboards and it has been revised to include rules that support the new code change. Several manufacturers are now making listed touch-safe barriers that will come with service panelboards as a standard feature (see image). As well, aftermarket kits are being sold that serve the same purpose.

The new exception makes it clear that the rule does not apply to service panelboards that have more than one service disconnect as allowed in 408.36 Exceptions 1, 2, and 3. For these types of service panelboards, it would be extremely difficult to ensure that no live parts are present when de-energizing one or more breakers.

Below is a preview of the NEC^®. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2017 NEC^® edition of NFPA 70.