Canadian Electrical Industry News Week

 

July 9, 2017

Bill BurrIn this article: Section 52 — Diagnostic imaging installations. The CE code is a comprehensive document. Sometimes it can seem quite daunting to quickly find the information you need. This series of articles provides a guide to help users find their way through this critical document. This is not intended to replace the notes in Appendix B or the explanations of individual requirements contained in the CEC Handbook**, but will hopefully provide some help in navigating the code.

Rule 52-000 Scope states that Section 52 is a supplementary or amendatory section of the code and applies to the installation of X-ray and other diagnostic imaging equipment operating at any frequency, but does not provide any specifications for safeguards against radiation. Information on radiation safeguards is contained in the series of Health Canada Safety Codes for radiation protection. The CSA CEC Handbook provides additional explanations and tables.

Rule 52-002 provides some special terminology for this section, and defines momentary and long-term ratings of 20 seconds and 5 minutes respectively for operation of applied x-ray and computerized tomography equipment.

Rule 52-004 provides guidelines for guarding of high-voltage parts, and requires that high-voltage parts be contained within bonded to ground metal enclosures, or within separate rooms or enclosures where a circuit control switch controlling the diagnostic imaging equipment is interlocked, to be open when the door is open and unlocked, and be insulated from the enclosure. In addition, high-voltage circuit conductors must be of the shockproof type. If a milliammeter is provided, it must be either connected in the bonded-to-ground circuit conductor, or guarded, if connected in the high-voltage conductor.

Rule 52-006 permits mobile diagnostic equipment, and permanently connected diagnostic equipment on a 30 amp or less branch circuit, to be supplied with a plug and hard-usage cable or cord.

Rule 52-008 specifies that a disconnect must be placed in the supply circuit in a location accessible from the radiation control of the diagnostic equipment. The rating of the disconnect for X-ray or computerized tomography equipment is based on 100% of the power input required for the long-time rating of the equipment, or 50% of the power input required for the momentary rating of the equipment, whichever is greater. For equipment on a 120volt, 30amp circuit, the required disconnect may be a receptacle and plug of the appropriate size.

Rule 52-010 exempts transformers and capacitors, forming part of diagnostic imaging equipment, from the requirements of Section 26. This equipment must comply with the CEC Part II product standard for the equipment. Capacitors must be provided with a means for automatically discharging and grounding the plates when the supply is disconnected. This is not required if the current-carrying parts of the capacitors and conductors are located 2.5 meters or more above the floor and accessible to only authorized persons, or, if located within 2.5 meters of the floor, within

• metal enclosures that are bonded to ground, or
• enclosures of insulating material

Rule 52-012 provides for protection where step-up transformers are used for diagnostic equipment. The low-voltage circuit of the step-up transformer is required to have an overcurrent device with no exposed live parts, installed as part of or adjacent to the equipment that protects the high-voltage radiographic circuit from all fault conditions. Where the above overcurrent device is too large to protect other fluoroscopic or therapeutic circuits on the equipment, additional overcurrent protection needs to be installed to protect these circuits. In the case of portable equipment, the above requirements also apply. However, an exemption can be applied if all high-voltage parts are enclosed in a single metal enclosure, bonded to ground. Where more than one apparatus is supplied by a common high-voltage source, other switches must be installed to independently disconnect each apparatus from the high-voltage source.
Rule 52-014 reiterates that all non-current-carrying parts of apparatus, including ancillary equipment, must be bonded to ground in accordance with the requirements of Section 10.

Rule 52-016 provides the requirements for determining ampacity of supply conductors and rating of overcurrent protection for diagnostic imaging equipment. For a single piece of equipment, use the larger of

• the long-time current rating of the equipment, or
• 50% of the momentary current-rating required on a radiographic setting

Note that this information is contained on the equipment faceplate.

Where more than one piece of diagnostic equipment is supplied, the rating of the supply conductors and overcurrent device is based on

• the sum of the long time current ratings of all the equipment supplied by the circuit, or
• Tthe sum of 50% of the maximum momentary current rating for the two largest units supplied, plus 20% of the maximum momentary current rating of the other units, when the equipment is on a radiographic setting

In the next installment, we will be discussing Section 54 — Community antenna distribution and radio and television installations.

* The source for this series of articles is the Canadian Electrical Code, Part I, published by CSA
** Note the CEC Handbook is also published by CSA.

William (Bill) Burr is the former Chair of the Canadian Advisory Council on Electrical Safety (CACES), former Director of Electrical and Elevator Safety for the Province of BC, and former Director of Electrical and Gas Standards Development and former Director of Conformity Assessment at CSA Group. Bill can be reached at Burr and Associates Consulting billburr@gmail.com.

 Electrician Forum Brought to You by Schneider Electric             

The Electrician Forum is a monthly column that provides valuable information to electricians and electrical contractors on current industry trends and concerns. 

Schneider ElectricSponsored by Schneider Electric

In this issue: 

Owning your own business is something many of us have dreamt of doing. Who wouldn’t want to be their own boss? It is a valid question that many entering the electrical trade consider. However, dreams tend to create an image that doesn’t always suit reality. Surviving in the residential electrical market involves a lot of out of the box thinking and as we have said and can’t stress enough, hard work. To gain insight into the various challenges faced by small electrical contractors EIN sat down with Steve Beeby, Master Electrician, and owner/operator of Beehive Electric, as small residential electrical contracting company based in Elmvale, Ontario.

read more...

Watch a portion of the interview conducted by Electrical Industry Canada with Steve Beeby of Beehive Electric

 

CSA

Now in its 24th edition, the 2018 Canadian Electrical Code, Part I includes a number of significant updates and changes to better help electrical workers in the safe maintenance of electrical equipment and create safer electrical installations.

This edition features important revisions to many sections. For example, Section 26 now mandates the use of tamper-resistant receptacles in additional areas where children may be present. Section 62 now requires ground fault circuit interrupter protection for heating devices and controls in proximity to tubs, sinks, and shower stalls. Section 10 has been updated, reorganized, and significantly reduced in length.

 Read more...

 



Tools for the Trade

  • Prev
  IDEAL Industries has introduced Combination Drill Taps to its tool lineup. Combining the ...
  Stripping and crimping device, 100 - 240 V input voltage, for insulated ferrules with a ...
Professional all-in-one cutter/stripper for coaxial and twisted pair cables     ...
  Klein Tools' Coax Explorrer 2 tests coaxial cable and maps up to 4 locations   ...
  Ideal Industries' T-14 wire stripper s are ideal for all professionals working within the ...
  The ATS850 conveyor eliminates all types of electro static discharge requirements. ...
  Lorik Tool & Automation has the experience and ability to manufacture a variety of ...
  Ideal Industries' 26 piece insulated Journeyman kit is ideal for new electricians or for ...
  Klein Tools Deluxe Fish Rod Set comes in 19 pieces that when assembled can fish wire and ...
  BendWorks Software was designed to help electrical contractors adopt this new process ...

 Sean Freeman

Sean Freeman is a vibrant, enthusiastic and selfless individual who has taken his trade expertise beyond that of a simple career. Not only is he a Master Electrician but he has traveled around the world as an electrical technician delegate with the Red Cross Emergency Response Unit. His skills are a vital part of emergency response and disaster relief.

In 2013 Sean responded to Typhoon Haiyan in the Philippines. In 2014 Sean spent almost a month in Kenema, Sierra Leone working at the Ebola Treatment Centre. There he was responsible for ensuring electricity and clean water were available, and worked to strengthen the infrastructure of the facility. 

read more

Kerrwil Publications

538 Elizabeth Street, Midland,Ontario, Canada L4R2A3 +1 705 527 7666
2016 All rights reserved

Use of this Site constitutes acceptance of our Privacy Policy (effective 1.1.2016)
The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Kerrwil