Electrical Enclosures in Canada

Solution Control Systems is the authorized distributor for high end, cost effective, CSA/UL approved enclosures manufactured by Saginaw Control and Engineering. These electrical enclosures are available in wide variety and with lots of accessories which can be fitted to the enclosures afterwards. The accessories include, floor mount stand kit, window kits, heaters, fans, filters, rain hoods, drip shields, inner doors, side pans, enclosure lights, air conditioners, air to air heat exchangers etc. for different applications. Drawings available online in few different formats for ease of designing a system or for detailed information. These are available in nema 1, 12, 3R, 4 and 4X standards. These enclosures also have a series of Vented Type 3R Enclosures which are designed to house electrical controls, drives, instruments and components used in an outdoor environment to provide a degree of protection for the equipment inside the enclosure against ingress of solid foreign objects (falling dirt);and provide a degree of protection with respect to the harmful effects on the equipment due to the ingress of water (rain, sleet, snow). This design incorporates a rain cap that acts as a solar shield to minimize solar heat gain, rain hood with filters for air intake, and cooling fans exhaust out the top to control internal heat load, with six standard sizes available.

For more information visit http://www.saginawcontrol.com/ Download the pdf copy of catalog http://www.saginawcontrol.com/sce-catalog-12.pdf

 

ARC Flash Enclosures

The Variable Frequency Drive panels for the hazardous adds additional issues of possible high voltage discharge sparks, and heat

The environment inside the panel will involve harmonic noise to which various types of dust behave differently. Cleanliness inside the panel is paramount. Following explanation will equally apply for VFD panels in Hazardous area.

Hazardous location (hazloc) panels and explosion proof panels are designed for use in the following classified areas:

  • Class I, Div. 1 & 2, Groups B, C, D
  • Class II, Div. 1 & 2, Groups E, F, G
  • Class III

The applicable standards for these panels are as follows:

  • NEMA: 3, 3R, 4, 7BCD, 9EFG
  • cUL to CSA Standard C22.2 No. 30, No. 25
  • UL Standard: 1203
  • Enclosure Type 4X (requires 4X option)

The panels are designed to protect the internal systems from external factors such as explosions, combustible gases and dust particles.

The connections between the filed instrumentation and internal panel components may be connected through Zener barriers or intrinsically safe barriers.

Explosion proof panels are built with robust metal walls to allow the containment of internal explosions from components and the sustainment of external explosions.

Fittings, glands, and other system components will be ensured to have the appropriate rating for the the above mentioned standards. Components with a general area classification cannot be used. The doors of the enclosure sections are built with water tight seal compounds and gaskets between them.

The following are some steps taken to specify such panels:

  1. Determine the environmental specifications
  2. Determine the explosion protection classification
  3. Determine the purging or pressurization requirement (if needed)
  4. Specify any necessary electrical enclosure modification

There are multiple ways of protecting electrical equipment to prevent an explosion when used in the presence of a flammable gas, combustible dust, or easily ignited fibers.

For an explosion to occur, there must be three elements present – fuel, oxygen, and an ingnition source. The fuel and oxygen must be present in the correct amounts – not enough fuel (a lean mixture), or too much fuel (a rich mixture) cannot ignite.

Each method of protection addresses the Fire Triangle in some way – either by containing and internal explosion or eliminating one or more of the components necessary for an explosion to occur.