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...
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)...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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)...
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...
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...
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...
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...
