Fire and Life Safety Systems
Fire Alarm System
The Fire Alarm Systems on all three campuses are monitored and supervised 24-7 by the Tufts Police Communications Centers located on the Boston and Medford campuses. The systems are engineered, installed and supervised in accordance with applicable Massachusetts fire and building codes. The systems are maintained, inspected and tested annually in accordance with applicable code. Smoke detectors are ceiling mounted in each resident’s room, the common hallways, stairways and corridors. Horn/strobe warning devices are installed to alert occupants to a life threatening incident. Manual Fire Alarm Pull Stations are located at every exterior exit on all levels of the buildings. Bedroom smoke detectors (local device) are programmed to alert the occupants if the origin of the smoke is in that room only. The detection devices (system devices) in the common areas (i.e., kitchens, living rooms, hallways, stairways and basements) sprinkler head activation, or the activation of a manual fire alarm pull station will sound the building wide evacuation alarm and will also sound in all of the individual student rooms. Whenever a fire alarm activation is transmitted to the Communications Center, a Tufts Police patrol officer is immediately dispatched to the location and the local fire department is notified and responds. The patrol officer arrives within 2-3 minutes, followed by the local career fire department whose response time is usually 3-4 minutes. Upon arrival, the patrol officer determines the location of the alarm activation and proceeds to that location to verify the incident. When the fire department arrives, they assume command of the incident and investigate the reason for the activation. All of the university buildings are equipped with portable, multi-purpose, dry chemical fire extinguishers. Tufts patrol officers are trained to operate the fire extinguishers. If the fire is small enough to be controlled or extinguished by its use, the officer will attempt to extinguish the fire.
Fire Sprinkler System
The fire sprinkler systems on all three campuses are monitored and supervised continuously by the Tufts University Communications Center located on the Boston and Medford campuses. The systems are engineered, installed and supervised in accordance with applicable Massachusetts codes. 97% of all fires in fully sprinklered buildings are controlled by two sprinkler heads or less. When the temperature reaches 155° at the sprinkler head, the fusible link releases and water flows to control and contain the spread of the fire. Only that sprinkler head flows water, subsequent heads will flow water only when the temperature releases the fusible link.
Carbon Monoxide Detection
In accordance with the applicable Massachusetts code, all university residential buildings that contain fossil fuel burning equipment or have enclosed parking are equipped with Carbon Monoxide Alarm protection. The detection devices are wall mounted within ten (10) feet outside of any bedroom on each level of the dwelling unit. When the device has detected abnormal parts per million of carbon monoxide (CO), it sounds a local warning and sends a signal to the Tufts University Communications Center who will dispatch emergency services resources appropriate to the conditions.
Types Of Electrical Wiring For Your House
electrical projects have one thing in common: electrical wiring. When installing new wiring, knowing what type of wire or cable you need is essential. Having basic knowledge about the types of electrical wiring will help you find out more about the existing circuits in your home. For instance, it will be simpler for you to identify which wire goes where when looking in the junction box.
Cable vs Wire
It’s important to understand some of the basic terms which are used when describing wiring. An electrical wire is a conductor, a material which conducts electricity. For household wiring, the material is either copper or aluminium (or copper-sheathed aluminium), although aluminum is not really used anymore. It can be stranded wire or solid metal conductor and in most cases, it is insulated, using a non conductive plastic coating. On the other hand, a cable is the combination of two or more wires, assembled using a single jacket. In modern homes, the NM (nonmetallic) cable is the most common type. This consists of two or more individual wires wrapped inside a protective plastic sheathing and contains:
- one or more “hot” (current-carrying) wires
- a neutral wir
- a ground wire
1. NM Cable
The most common type of home electrical wiring is the NM cable, also known as the Romex cable, after the most popular electrical wiring brand name. The NM cables contain three or more individual conductors, wrapped together in a sheathing, which is a flexible plastic jacket. This type of cable is generally used for dry, interior home wiring and this includes appliances, fixtures, switches, and outlets. Today, the NM cables are color-coded, meaning that the outer jacket of the cable comes in different colors to indicate the wire gauge.
2. Armored Cable
When it comes to house electrical wiring, local ordinances are more strict than national codes. That is why you might find that in some areas NM cables are not permitted for use and in these locations, armored or AC cables are used instead. AC wiring, also known as BX, goes back to the early 1900s and is designed with flexible metallic sheathing, which offers extra protection for the conductors inside. In commercial buildings or residential constructions with more than three stories, AC cannot be used.
3. Underground Feeder Cable
UF (underground feeder) is an NM cable which is specifically designed for wet locations and direct ground burial. When running wires underground or to outdoor projects, you need to use the UF cable. Another option electricians choose is using PVC conduit underground and pulling wires through. This type of cable is generally used for supplying outdoor fixtures and it contains insulated hot and neutral wire, plus a bare ground wire. Unlike the NM cable, the UF type has a solid plastic sheathing around each wire and has a gray outer sheathing. Additionally, this type of cable can be used for major circuit wiring.
4. Low-Voltage Wire
Low-voltage wiring is used for circuits that use less than 50 volts. This type of wiring is the right choice for items that do not require a lot of electricity, like doorbells, thermostats, sprinkler systems or landscape lighting. Low-voltage wiring varies from 12 to 22-gauge and it’s either insulated or comes covered in cable sheathing. Even though shocks don’t usually occur with low-voltage wires, it is still a good idea to turn off your devices before starting to work with them.
5. THHN/THWN Wire
Two of the most common types of insulated wires are the THHN and the THWN. Unlike the NM cable, these are single conductors, each having its color-coded insulation. And they are protected by a plastic or tubular metal conduit.
- Hot wires are black, orange or red;
- Neutral wires are white or brown;
- Ground wires are green or yellow-green.
6. Phone and Data Wire
Phones and internet wiring both use low-voltage wires. Although the most common type of cable for this is Cat (Category) 5, your telephone and data cable may have anywhere from four to eight wires. The category 5 cable contains eight wires, wrapped together in four pairs and it’s the most efficient type for phone and data transmission. Also, the cat 5 cable brings greater capacity and quality than the standard phone wire. Even though data wiring doesn’t carry a high amount of voltage, it is still dangerous to have data wiring coming in contact with household wiring. So, treat it carefully and avoid touching bare wires