![]() ![]() Effective January 1, 2023, not just power distribution blocks, but any pressure connector or device used to splice or tap service conductors shall be marked “suitable for use on the line side of the service equipment” or equivalent.Power distribution blocks installed on service conductors shall be marked “suitable for use on the line side of the service equipment” or equivalent.Power distribution blocks, pressure connectors, and devices for splicing or tapping service-entrance conductors shall be listed.The revised 2020 requirements specify the following: In the 2020 NEC ®, the language previously located in 314.28(E)(1) was revised and relocated to 230.46 and now applies to power distribution blocks used with service-entrance conductors regardless of the enclosure type they are used in. In the 2017 NEC ®, similar code language was added to 314.28(E)(1) with the intent to have the rules apply to power distribution blocks in any box or enclosure. Since the above code language was only found in Article 376, it was only applicable if the power distribution blocks were installed in a metal wireway. Before the code language was added, it was common practice to see any kind of power distribution block used ahead of service equipment with no regard to the suitability of the product being located on the line or load side of an overcurrent protection device. In the 2014 NEC ®, code language was added in 376.56(B)(1) to ensure that power distribution blocks installed on the line side of the service equipment were listed for the purpose. Power distribution blocks are often used for splicing service-entrance conductors in metal wireways (covered in Article 376). Code Change Summary: New requirements were added for power distribution blocks ahead of a service disconnect. ![]()
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