fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
I'm looking for constructive criticism on the following, and if you think it is merited, support in the form of comments from you on 9-135. Thanks, Jim Williams
4 Comment:
alter the text as follows:
red means delete
450.21 Dry-Type Transformers Installed Indoors.
(A) Not over 1121⁄2 kVA.
Exception: This rule shall not apply to transformers rated for 1000 volts, nominal, or less that are completely enclosed, with or without except for ventilating openings.
5 Statement of Problem and Substantiation.
The new text does not parallel the text in:
450.21 Dry-Type Transformers Installed Indoors.
(B) Over 1121⁄2 kVA.
Exception No. 2: Transformers with Class 155 or higher insulation systems and completely enclosed except for ventilating openings.
And in:
450.22 Dry-Type Transformers Installed Outdoors.
Dry-type transformers installed outdoors shall have a weatherproof enclosure.
Transformers exceeding 1121⁄2 kVA shall not be located within 300 mm (12 in.) of combustible materials of buildings unless the transformer has Class 155 insulation systems or higher and is completely enclosed except for ventilating openings.
Using the same text for the same meaning reduces confusion.
4 Comment:
alter the text as follows:
red means delete
450.21 Dry-Type Transformers Installed Indoors.
(A) Not over 1121⁄2 kVA.
Exception: This rule shall not apply to transformers rated for 1000 volts, nominal, or less that are completely enclosed, with or without except for ventilating openings.
5 Statement of Problem and Substantiation.
The new text does not parallel the text in:
450.21 Dry-Type Transformers Installed Indoors.
(B) Over 1121⁄2 kVA.
Exception No. 2: Transformers with Class 155 or higher insulation systems and completely enclosed except for ventilating openings.
And in:
450.22 Dry-Type Transformers Installed Outdoors.
Dry-type transformers installed outdoors shall have a weatherproof enclosure.
Transformers exceeding 1121⁄2 kVA shall not be located within 300 mm (12 in.) of combustible materials of buildings unless the transformer has Class 155 insulation systems or higher and is completely enclosed except for ventilating openings.
Using the same text for the same meaning reduces confusion.