Loading...
Correspondence February 23, 2005 __uiu��uon���igiu�iigl��l�+ c��i _ CITY OF TIGARD OREGON Electrical Permit No.: ELC 2005 -00078 Address: 7157 SW Beveland St. Project name: Zimmler Developmaent Plans Dated: February 11, 2005 The plan review was performed under the Oregon Electrical Specialty Code (OESC) 2002 edition which includes the 2002 edition of the National Electrical Code (NEC). The submitted plans are approved subject to the following conditions: 1. This project is using series rated circuit breaker combinations to comply with NEC 110.9 (interrupting rating sufficient for the available fault current). These plans are approved based on the representation that the exact equipment and breaker combinations that will be installed are specifically certified as series rated combinations. The electrical contractor will be required to demonstrate to the field inspector that each piece of equipment that is relying on series rating is listed by its manufacturer as having been tested in the specific combination installed and is certified for the fault current available. (A check list is included to assist in this. More copies may be downloaded at www.bussmann.com). 2. Series combination rated equipment shall be marked per NEC 110.22. 3. All equipment to comply with NEC 110.9 (...sufficient to interrupt available current...) 4. The grounding electrode system must include all electrodes available on the premises (NEC 250.50 and 250.52) 5. All HVAC equipment requiring servicing shall have a 120 volt receptacle within 25 feet (NEC 210.63) and when located on a roof it shall have GFCI protection (NEC 210.8). 6. All HVAC equipment shall have a disconnect within sight. (NEC424.19 and 440.14) 7. Americans with Disabilities Act (ADA): It shall be the responsibility of the Architect, Engineer, Designer, Contractor, Owner and Lessee to research the applicability of the ADA requirements for the structure. The City of Tigard reviews the plans and inspects the structure only for compliance with the OESC which may not include all of the requirements of the ADA. • 13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772 CITY OF TIGARD OREGON 8. Approved Plans: One set of approved plans, bearing the City of Tigard approval stamp, shall be maintained on the jobsite. The plans shall be available to the Building Division inspectors throughout all phases of construction. Sincerely, / Kim Appleberry Electrical Inspector 13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772 4 INSPECTION FORM: Series Rated Combination ISSUED BY: This form provides documentation to assure compliance with the following National Electrical Code ®, NFPA 70, sections on the use of Series Rated Combinations: 110.9, 110.22 & 240.86 JOB # NAME: LOCATION: CONTRACTOR: ESSENTIAL INFORMATION: Lineside Fuse or CB Line Side Panel Designation (If applicable) (Protecting) Line Side Overcurrent Protective Device Part Number Available scc Line Side Overcurrent Protective Device Interrupting Rating y X Available Short Circuit Current at Line side OCP Device Available SCC Load Side Panel Designation Load Side Circuit Breaker Part Number DDD Load Side Circuit Breaker Individual Interrupting Rating Load Side CB - (Protected) Series Combination Interrupting Rating X2 Available Short Circuit Current at Load side Circuit Breaker Compliance Checklist (For further information see discussion on reverse side for each item) 1. Short- Circuit Currents Is the interrupting rating of the line side fuse or circuit breaker greater than the ❑ YES ❑ NO available short- circuit current (X1) at its lineside (110.9) Is the series combination interrupting rating greater than the available short- circuit ❑ YES ''3 NO current (X2) at the load side circuit breaker (permitted per 240.86)? 2. Manufacturer's Label Are both devices in use for the series rated combination marked on the end use equipment in which the load side circuit breaker is installed (or contained in a ❑ YES O NO booklet affixed to the equipment) as required in 240.86(A)? 3. Field Installed Label Are field labels, as required by 110.22, that indicate "CAUTION — Series Rated 3 YES J NO Combination ", along with the required replacement parts, panel designations, and series combination interrupting rating, installed on all end use equipment that contain the series combination rating devices? 4. Motor Contribution If motors are connected between the series rated devices, is the combined full load ❑ YES D NO current from these motors less than 1% of the downstream circuit breakers' interrupting rating (individual or stand alone interrupting rating) per 240.86(B)? 5. Selective Coordination Is this series rated combination being installed in something other than a health care ❑ YES ❑ NO facility (see NEC® 517.17)? Elevator circuits only: Is. this series rated combination being installed on an elevator ❑ YES U NO circuit with only one elevator in the building (see NEC® 620.62)? AN ANSWER OF "NO" TO ANY OF THESE QUESTIONS MAY INDICATE A LACK OF COMPLIANCE. LACK OF SUBMITTAL IS CONSIDERED AS EVIDENCE OF LACK OF COMPLIANCE. Series Rated Combination What is a Series Rated Combination? A combination of two devices, that have been tested under specific test conditions that work together to clear a fault. The allowed combina- tions are limited to those that have been selected by the circuit breaker manufacturer for testing. Only tested combinations can be used. CAUTION: A series rated combination allows a load side circuit breaker to be applied where the available short circuit current exceeds the interrupting rating marked on that circuit breaker. BACKGROUND TO CHECKLIST ITEM 1) Short- Circuit Currents 110.22 & 240.86(A) Labeling Contractor Installed Label The series combination interrupting rating must be greater i than the available short- circuit current at the load side cir- CAUTION cuit breaker (240.86) and the interrupting rating of the line Panel J Series Rated Combination side fuse or circuit breaker must be greater than the MDP1 with panelLDP1 available short- circuit current at its line terminals (110.9). Rated �OOO thOnly es Replace with Only 200 Amp Class J Fuses 2) Manufacturer's Label Since the use of series rated combinations are limited to . specific combinations that have been tested, the end use • equipment is required to be marked, by the manufacturer, Panel Mfr's Label per 240.86(A) of the 2002 NEC'. Since there are hun- • ./ dreds of combinations, this marking may be in a book that NUL Listing ofSeries is affixed to the end use equipment, as allowed in UL67. Combination Rating of The manufacturer's marking is used to verify that both 200,000 amperes when CB Co. devices are part of a recognized series rated combination, Contractor Installed Label _— ' XYZ Circuit &taker the panelboard is listed for use with the combination, and ® Protected by Maximum that the series combination interrupting rating is sufficient CAUTION � 400 A assJFuse for the available short circuit current. This label also Series Rated Combination provides guidance for future upgrades as to the specific with 200Amp Class J fuses in MDP1 replacement devices that are allowed. Rated 200,000 Amperes Replace with o aker ® ; Panel LDPl 3) Field Installed Label XYZCircmtreer 110.22 of the 2002 NEC requires the installer to apply a field caution label warning that a series rated combination is being used. This label must be applied on the panel containing the series rated combination or on both pieces of electrical equipment if the line side device is located separate from the load side circuit breaker to assure that the proper devices have been installed and that proper future replacements are made. The inspector can check the devices noted on the field label required by 110.22 against the tested and listed series rated combinations marked on the panelboard or switch- board by the manufacturer per 240.86. 4) Motor Contribution S eries Rated Combination A series rated combination is evaluated under specific testing condi tions of which motor contribution is not a part of the criteria. If a This dons not motor(s) were connected in the middle of the combination, it would Series Rated I comply n'ith ? EC`e supply extra fault current that did not exist when the combination was Combination 240.S6(B) tested. 240.86(B) of the 2002 NEC® addresses this by prohibiting the 2� itOti a I R use of series rated combinations when the sum of the full load current Motor Contribution of the motors exceeds 1% of the interrupting rating marked on the LOAD SIDE circuit breaker. For example, the load side circuit breaker is rated 10,0, 000 A.I.R., with loads motor loads excc eeding 100 amps, , t then a series rated combination could not be used. For other than lighting C'B standal..ne panels, it is necessary to investigate the protected circuit breaker of a Interrul, tin; R:ttin_ I series combination to insure that the protected circuit breaker's individual interrupting rating complies with 240.86(B). For other than . . 0 lighting panels, it is advisable not to utilize series rated combinations for building spaces where the loads may change during the life of the Nlutnr F. L.: \. > 11111.a (t'% I.R.) electrical system. If more motor loads are added. the series combina- tion rating for that application could be negated. 5) Selective Coordination A disadvantage of a series rated combination is that, by definition, for fault conditions the line side (protecting) device must open at the same time, and in conjunction with, the load side (protected) circuit breaker. This means that the entire panel loses power because the device feeding the panel must open under medium to high level short- circuit conditions. For life and safety reasons, the NEC' requires selective coordination in some applications. Main to feeder series rated combinations do not meet the requirements of 517 17 in health care facilities. Series rated combinations do not meet 620.62 for elevator circuits that contain more than one elevator Series rated combinations would reduce the overall system reliability of emergency circuits as presented in 700.25 FPN because of their inherent lack of fault current coordination.