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UL 521 BULLETIN
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
Organization:
UL - UL
Year: 2010
Abstract: These requirements cover heat detectors for fire protective signaling systems intended to be installed in ordinary indoor and outdoor locations in accordance with the Standard for Automatic Fire Detectors, NFPA 72E.
Heat detectors covered by these requirements employ either normally open contacts or normally closed contacts, provide an electronic signal, or consist of a heat-sensitive cable. The requirements do not cover heat detectors for journal-alarm or unit-alarm devices.
Deleted October 3, 2002
Heat detectors covered by these requirements employ either normally open contacts or normally closed contacts, provide an electronic signal, or consist of a heat-sensitive cable. The requirements do not cover heat detectors for journal-alarm or unit-alarm devices.
Deleted October 3, 2002
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UL 521 BULLETIN
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| contributor author | UL - UL | |
| date accessioned | 2017-09-04T18:29:35Z | |
| date available | 2017-09-04T18:29:35Z | |
| date copyright | 07/07/2010 | |
| date issued | 2010 | |
| identifier other | ITXNTCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/211813 | |
| description abstract | These requirements cover heat detectors for fire protective signaling systems intended to be installed in ordinary indoor and outdoor locations in accordance with the Standard for Automatic Fire Detectors, NFPA 72E. Heat detectors covered by these requirements employ either normally open contacts or normally closed contacts, provide an electronic signal, or consist of a heat-sensitive cable. The requirements do not cover heat detectors for journal-alarm or unit-alarm devices. Deleted October 3, 2002 | |
| language | English | |
| title | UL 521 BULLETIN | num |
| title | UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | UL - UL:;2010 | |
| contenttype | fulltext |