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  1. katwalatapan

    Triggering power supply using relay module

    Hello, I'm working on an application to install door hold-open devices in a facility which does not have a fire alarm control panel. The facility does have smoke alarms installed. The intention is to remove power to the door hold-open devices during a smoke alarm condition. I'm planning to...
  2. katwalatapan

    PV system sizing as per main electrical service

    Hello, I'd appreciate some feedback on the following PV system sizing scenario: The main electrical service for the building is 400A, 1-phase, 120/240V. The main CDP is rated for 400A, 1-phase, 120/240V. Based on the 20% power feedback rule, I'd be permitted max. of 80A (19.2 kW PV system)...
  3. katwalatapan

    Junction box installation on grade

    Hello, I wanted to inquire if installation of junction box on grade to extend the existing U/g feeders to a generator system, is a good installation practice or not? An exterior generator is planned for relocation. Currently three (3) U/g feeders in conduits are run to the generator. The...
  4. katwalatapan

    NFPA 20 - Location of Fire Pump Controller and ATS

    Hello, In one of our projects, an existing fire pump is being conneceted to a new emergency generator. New fire pump controller with Automatic Transfer Switch (ATS) within the same cabinet is also being planned. Due to site conditions, the new fire pump controller with ATS cannot be installed...
  5. katwalatapan

    Cantruss stand for ATS

    Hello, We are installing a generator to back up some building system loads as well as an existing fire pump. The separate fire-pump rated ATS is needed to be installed on a cantruss stand instead of being wall mounted adjacent to the fire pump controller, due to the unavailability of wall...
  6. katwalatapan

    No ground conductor in lighting branch circuit

    Hello, I'm working on a renovation plan for a corridor area in my house. The building is relatively old (1980s) and during initial scoping, I noticed that there is no ground conductor on the lighting circuits for this area. I wanted to inquire if installing a grounding conductor to the...
  7. katwalatapan

    Connecting CO alarm with addressable fire alarm panels

    Hello, I'm working on an application to connect Carbon Monoxide (CO) alarm in a utility room with the building's fire alarm panel so that the CO alarm could be monitored via an off-site monitoring station. In conventional panels both Kiddie and BRK have CO alarms and relevant relay modules...
  8. katwalatapan

    Piezo mini-horn installation

    Hello, We are considering installation of piezo mini-horns in each apartment unit of a multi-unit residential building. The building has a conventional fire alarm system with bells in the corridors for notification. The addition of piezo mini-horn in each unit is to ensure minimum audibility...
  9. katwalatapan

    Electric baseboard query

    Hello, I have a few application related queries concerning standard, electric baseboards with front heat discharge and linear, convectors with top heat discharge. I understand that the linear convectors are more compact, but are following concerns valid: 1. Linear convectors provide uneven...
  10. katwalatapan

    Electric baseboards - Top discharge vs front discharge

    Hello, I have a few application related queries concerning standard, electric baseboards with front heat discharge and linear, convectors with top heat discharge. I understand that the linear convectors are more compact, but are following concerns valid: 1. Linear convectors provide uneven...
  11. katwalatapan

    Mitigating nuisance alarms in Emergency Alarm System

    Hello, We've installed a Chubb Edwards Emergency Alarm System in a 9-unit, seniors, multi-unit, residential building. The building as per code does not require a dedicated fire alarm system, but we wanted to monitor any emergency conditions within the building, so we installed an Emergency...
  12. katwalatapan

    Electrical outlet for HRV inside ceiling bulkhead

    Hello, The mechanical engineer has installed the HRV including the supply and exhaust ductwork in a ceiling bulkhead. Access hatch has been provided for maintenance access. For such HRV installed inside the bulkhead, would it be better (code compliant) to install an electrical outlet in the...
  13. katwalatapan

    Electrical conduit for PV system in exterior wall

    Hello, I'm working on a plan to install 4kW, 1-phase, 240VAC, grid-tied, micro-inverter based, Photo-Voltaic System no a rooftop in a multi-unit residential building. I wanted to inquire if it is an acceptable practice to run the AC cables from the rooftop junction box to the PV AC Disconnect...
  14. katwalatapan

    Control of multiple motors using one controller

    Hello, I'm working through a scenario where we have one (1), motor control panel controlling three (3), effluent pumps, in a lead-lag operation. Each effluent pump is 1/2 HP, 240V, 1-phase, 7 Amp. FLA. The motor control panel is rated to control the applicable three (3), effluent pumps. I...
  15. katwalatapan

    Access Control System and Automatic Door Operator

    Hello, I have few queries concerning the use of Access Control System and Automatic Door Operator System installed on the same door. The door in this case is an exterior door on a building which grants access to the lobby. The door has FOB type access card reader to grant access and automatic...
  16. katwalatapan

    Multiple ATS configuration for generator

    Hello, I have a query concerning multiple ATS configuration for single, SG050, 50kW, 3-phase, 120/208V, generator. I'm considering a scenario, where a 200A, 3-Pole, HTS series ATS is connected to the SG050 generator. The 200A, ATS feeds a 200A, 3-phase, 120/208V, emergency panel. Nine (9)...
  17. katwalatapan

    Feeding Grid-Tied PV System back to the electrical distribution system

    Hello, I wanted to inquire, whether it would be recommended to feed the Grid-Tied PV system back in the electrical panel which are either backed-up by emergency generator or panel receiving stepped down voltage from a higher voltage source. Our facility has 1200A, 3-phase, 575V, electrical...
  18. katwalatapan

    Sizing electric tankless Domestic Hot Water system

    Hello, I wanted to inquire if an electric tankless domestic hot water system could be sized per apartment square footage? I'm looking to size a tankless DHW system for a 900 sqft apartment with one bedroom and den. The plumbing fixtures which require hot water are the kitchen faucet...
  19. katwalatapan

    Propane or Diesel fuel for Generator

    Hello, I wanted to inquire if there is a practical size threshold for generators to decide if propane-fired or diesel-fired generators should be procured. I am working on specifying a 30kW, 3-phase, 120/208V generator to back-up house panel loads in a multi-unit residential facility. The...
  20. katwalatapan

    Motor overload setting

    Hello, The existing motor is 3-phase, 208V, 3.82A FLA. It is controlled via an Eaton motor starter rated for 18A and an overload setting of 4.56A. The motor is damaged and as a stop gap measure, an available 1-phase, 208V, 5.68A FLA motor could be installed. I've confirmed with the...

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