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Siemens TYPE VBII Series Application Manual page 55

Safety switches
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Siemens Type VBII Safety Switch
Suggested Specifications Continued
3. SWITCH ENCLOSURES
3.1 Switch covers shall be attached with pin-type hinges.
Except for outdoor General Duty 30A switches, top-hinged
doors are not acceptable.
3.2 Enclosures for Type 3R switches through 200A shall have
provisions for interchangeable bolt-on hubs in the top endwall.
Hubs shall be Siemens Type HS or HA hubs sized as indicated
on the plans.
3.3 Switches shall have wire-bending space and lug capacity
for one size larger Al/Cu wire than NEC and UL minimum
requirements.
3.4 The enclosure shall be finished with [gray baked polyester
paint which is electrodeposited on cleaned, phosphate pre-
treated steel (Type 1)], [gray baked polyester paint which is
electrodeposited on cleaned, phosphate pre-treated galvanized
steel (Type 3R & 12)], [a brush finish on type 304 stainless steel
(Type 4/4X stainless steel)].
3.5 All Heavy Duty switch enclosures shall have a formed front
flange to provide additional strength and rigidity.
3.6 Tangential knockouts shall be provided for switches rated
30-600A in Type 1 and 3R enclosures where permitted.
3.7 Cover latching means for Type 4/4X & 12 rated through
1200A shall be quick-release, lift-lever type.
3.8 Type 12 enclosures shall be dual rated as Type 3S to allow
their use in outdoor applications.
3.9 Cover viewing window shall be an available option on 30-
400A NEMA 12 and 4/4X stainless steel switches. The window
must allow viewing of both visible blades when the switch is
OFF and viewing of indicating fuses in 30-200A ratings.
3.10 All Heavy Duty switches shall have metal nameplates,
except for non-metallic switches, which must
have plastic nameplates.
4. SWITCH RATINGS
4.1 All switches shall be UL-listed.
4.2 30-200A Heavy Duty switches shall also be horsepower
rated for AC and/or DC as indicated on the plans.
4.3 Switches shall be horsepower rated for design E motors on
internal labeling.
4.4 The Heavy Duty switch UL-listed short-circuit current rating
shall be: [10,000 RMS symmetrical amperes when used with
orprotected by Class H or K fuses (30-600 amperes)]
[200,000 RMS symmetrical amperes when used with or
protected by Class R or Class J fuses (30-600 ampere switches
employing appropriate fuse rejection schemes)]. [200,000 RMS
symmetrical amperes when used with or protected by Class L
fuses (800-1200 amperes)].
4.5 All switches intended for service entrance shall be UL
approved for this application.
4.6 All Heavy Duty switches shall be I2t rated.
C. APPROVED MANUFACTURERS
1.1 Switches shall be manufactured by Siemens (no equal) or
approved equal.
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