Every week we will be including additional questions and informal UPC and UMC interpretations
- In the UPC 1. Would a pressure regulator and strainer located above a T–bar suspended acoustical tile ceiling meet the accessibility requirements of Section 608.2? 2. Does a strainer located above a T–bar suspended acoustical tile ceiling comply with the Code requirement that it be readily accessible?
- 1. Yes. The intent of the readily accessible requirement for the strainer is to provide a totally unobstructed or unimpaired clearance to access the regulator assembly for servicing. 2. Yes. The same answer for question #1 applies to question #2.
- In new construction, is a clothes dryer allowed by the UMC in a garage at floor level?
- Yes, but only if all components capable of generating a glow, spark, or flame that could ignite flammable vapors (including pilots, burners, heating elements, or switches) are located at least 18 inches above the garage floor (UMC Section 308.0 [307.0, 2009]). This section also requires that appliances installed in garages be protected from mechanical damage
- Does the term "floor-ceiling" and "floor-subfloor" mean that a 'water-tight pan' is required on all floors of a building except for slab on grade locations?
- A water-tight pan would be required in all attic installations and other relatively concealed locations, where the supporting structure is assembled of components which could fail due to undetectable water leakage. In all cases, the point of discharge must be in a readily observable location as to immediately alert the occupant(s) of required maintenance.
- Does gas piping installed in such a way as to be laying on and supported by trusses, joists, or other structural members, at least at intervals required by Table 13-3, require attaching to these structural supports with metal straps?
- Yes. Section 1311.2.6(A) [1312.2.6(A), 2009; 1311.2.5, 2012; 1311.2.4, 2015; 1310.2.4, 2018] requires gas piping to be "adequately supported by metal straps or hooks at intervals not to exceed those shown in Table 13-3 (2003/2006/2009), T13126.96.36.199 (2012)." All piping must be secured to prevent movement. Properly securing the piping ensures that a good-faith effort has been applied to prevent unintended lateral movement which might result in the piping being damaged or strained.
- Does UPC Section 704.3 mean that a dishwashing machine cannot be drained into a properly vented floor sink?
- Section 704.3 lists a number of items after which it states “and other similar fixtures.” Unless constructed as part of a “fixture,” dishwashing machines would normally be construed as something other than a fixture.
- Is it required in the UMC that voids around piping passing through concrete floors on the ground be appropriately sealed? For example, in houses with slab-on-grade construction, where the drain line for the tub and shower penetrates the slab, is this area required to be sealed?
- Yes. All pipe openings in an on-grade slab within the fixed limits of the building foundation must be "appropriately sealed" to prevent insects or vermin from entering the building.
- We are having troubles with waste airgap installations for domestic dishwashers that are drained through the garbage disposal. As you know, this creates a situation that requires an airgap device above the flood level rim of the sink. Why can’t a dishwasher be plumbed through an indirect waste that is independent of the sink and the garbage disposal? Such a method would allow the dishwasher to drain indirectly, similar to an automatic washer.
- In reply to the inquiry on waste airgaps for domestic dishwashers, perhaps a little history would help. This requirement, Section 807.3 was added a number of years ago based on the knowledge that a domestic dishwasher was not only a washer, but also was frequently used as a storage compartment for clean dishes which were allowed to dry in a sterile atmosphere and therefore, this appliance should be connected in such a manner that there would be no possibility of sewage, waste water, garbage, or other contaminates entering the storage chamber. In answer to the question, we see no reason why a dishwasher cannot be discharged either into a garbage disposal, a separate trap or, as was quite prevalent at one time, into the kitchen sink, provided in all cases the dishwasher waste line includes a waste airgap.
- Does a factory supplied switch or breaker that is mounted in or on mechanical equipment satisfy the requirement of Section 309.0 for a "positive means of disconnect adjacent to and in sight from the equipment served?"
- No. The requirement for a disconnect is intended to allow the equipment to be replaced without having to isolate the equipment from a remote location. Therefore a disconnect must be located adjacent to or mounted on the exterior of the equipment to allow the equipment to be isolated at the equipment location to make it easily replaceable.
- In reference to UPC Sections 218.0 and 710.9, would the pump for a sewage ejector in a duplex be considered public or private? This question is for the purpose of using a dual pump system.
- Section 218.0 defines a private system as one which serves a “family or an individual.” Therefore, any system of piping, fixtures, or a sump which serves two or more families is considered to be public use. Since Section 710.9 requires dual sewage pumps or ejectors for public use occupancies, dual pumps are required for a duplex. See also 218.0, Public or Private Use and Public or Public Use
- Does the height restriction of 8 feet in UMC Section 304.2 (303.2, 2009) also apply to Section 701.2, which requires the volume of the room or space to be equal to or greater than 50 cubic feet per 1,000 Btu/h?
- No. This calculation is used only for calculating the minimum volume of rooms containing fuel-burning equipment not listed for closet or alcove installation. Note: The reference to the 8 foot ceiling in the training manual is only a coincidental example, as most ceilings are approximately 8 feet in height.
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