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UL LLC Outline of Investigation for Power Distribution Blocks

UL Outline © 2017 UL LLC
1953, Edition 6 Edition Date: March 15, 2019 $225.00-$250.00
Summary of Topics o1953_6_sum.html

Summary of Topics

The Sixth issue of the Outline of Investigation for Power Distribution Blocks, UL 1953, dated March 15, 2019, replaces the fifth issue published on August 29, 2014. This new issue includes the following changes:

1. Expand Scope to include power distribution blocks intended for use in photovoltaic applications rated up to 1500 Vdc (NEC Article 690).

2. Clause 7.1.2 refers to the applicable Wire Connector Standards (UL 486A-486B and UL 486E) for requirements for the connectors. This clause is relocated to appear as the first Clause of Section 7.1 (relocated to be “7.1.1”), and other sections which include requirements that are covered in the referenced connector standards are removed:

• Remove Section 6.1 (“Current-Carrying Parts”) as these requirements should match those in the wire connector Standards (See UL 486A-486B, Clauses 6.2.1 - 6.2.3). Subsequently, Section 6 is renamed from “Materials” to “Insulation” to reflect the remaining item in that Section
• Remove 7.1.6 - 7.1.8 as these requirements are covered by the wire connector Standards (which are referenced in the Outline).

3. Include option to test a power distribution block rated for use on the line side of the service disconnect with overcurrent devices on the load side of the device under test.

4. Table 7.1 is corrected to accurately reflect the ampacities, and the source of those values (NEC® Table 310.15(B)(16)).

5. Aligned numbering in the Short-Circuit Current Rating Statement with the explanation of what each blank is intended to state (see 18.4).

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