Which subsection specifies that tested series-rated combinations must be identified on end-use equipment, such as Panelboard and Switchboard?

Which subsection specifies that tested series-rated combinations must be identified on end-use equipment, such as Panelboard and Switchboard?

• A. 240.86(B)
• B. 240.86(A)
• C. 240.86(C)
• D. 240.86(D)

Answer: (A)

When a series-rated combination is used, it’s essential that the actual tested configuration is clearly identified on the equipment so field personnel know exactly which combination is approved and can verify it matches the equipment’s rating. This labeling prevents installing untested or inappropriate pairings that could exceed the device’s safe operating limits, keeping the short-circuit current rating accurate and the installation safe. The subsection 240.86(B) is the one that requires this identification on end-use equipment like panelboards and switchboards. It makes sure panels carry the necessary markings or labels showing which tested series-rated combinations are permitted, so replacements or maintenance don’t introduce unapproved configurations. Other subsections in the same section address related but different requirements—such as other labeling, testing, or rating details—not this specific mandate to identify tested series-rated combinations on the equipment itself.

When a series-rated combination is used, it’s essential that the actual tested configuration is clearly identified on the equipment so field personnel know exactly which combination is approved and can verify it matches the equipment’s rating. This labeling prevents installing untested or inappropriate pairings that could exceed the device’s safe operating limits, keeping the short-circuit current rating accurate and the installation safe.

The subsection 240.86(B) is the one that requires this identification on end-use equipment like panelboards and switchboards. It makes sure panels carry the necessary markings or labels showing which tested series-rated combinations are permitted, so replacements or maintenance don’t introduce unapproved configurations.

Other subsections in the same section address related but different requirements—such as other labeling, testing, or rating details—not this specific mandate to identify tested series-rated combinations on the equipment itself.