0
How far apart should straps be place on electrical metallic tubing conduit?
Wiki User
∙ 14y ago
Assuming your local jurisdiction adopts the NEC as code, EMT must be fastened within 3 feet of each termination point (box, cabinet, conduit body, etc.) and every 10 feet of conduit run. Where the (horizontal run) EMT passes through a hole in a framing member is allowed to count as a support in lieu of a strap. You can place fasteners closer if you want, but not further apart.
There are two exceptions.
#1 You can increase distance "within 3 feet of a termination" to 5 feet where structural members do not readily permit fastening within 3 feet.
#2 For concealed work in finished buildings or prefinished wall panels where such securing is impractical, unbroken lengths (without couplings) of EMT shall be permitted to be fished.
Reference 2005 NFPA 70 (NEC) 358.30(A)(B)
Of course if you do not live in the US, or if your local municipality has adopted a different code or adopted the NEC with ammendments, your local law could be different. Check with the local building department to be sure.
Wiki User
∙ 14y ago
Wiki User
∙ 8y agoIt does not matter how far the boxes are apart. They can be whatever the design calls for. The number to remember is the amount of boxes that the electrical code will allow be added to one electrical circuit.
Wiki User
∙ 7y agoThe Canadian Electrical Code states that Electrical metallic tubing shall be installed as a complete system and shall be securely fastened in place within 1 m of each outlet box, junction box, cabinet, coupling, or fitting. The spacing between supports shall be ,1.5 m for 16 mm and 21 mm trade size conduit, 2 m for 27 mm and 35 mm trade size conduit and 3 m for 41 mm trade size conduit and larger.
Add your answer:
Earn +20 pts
Name three tools that you can use to protect a system against ESD as you work on it?
ANSI/ESD S20.20 covers the requirements of an ESD control program. The fundamental ESD control principles are: - Ground all conductors, including personnel - Insulators are high charging and cannot be grounded. Remove all non-essential insulators. Keep all process essential insulators at least 12" from ESDS or neutralize charges with ionizers - Outside an EPA, ESDS are to be packaged in closed ESD shielding bags or covered containers having shielding properties Grounding works great removing electrostatic charges. If opening a computer and handling circuit boards or electronics, the person should be grounded using a wrist strap connected to the ground of an AC electrical outlet or equipment ground. The ESD sensitive items should be placed on a grounded mat. A good tool to have is a Field Service Kit which includes a mat, a cord to ground the mat, and a wrist strap to ground the person. If attachment to the ground of an AC electrical outlet is not possible, one can use equipotential bonding. "When neither AC equipment [Equipment Grounding Conductor] or auxiliary grounds are available, an equipotential bonding system may need to be used. In this situation, all of the items in the system are bonded together so that the charge that resides on the elements will be shared equally and therefore there will be no potential difference between the items. Once this step has been completed it is safe to handle ESD sensitive parts without inducing damage. A real life example of this is often observed in office equipment field service operations. For safety reasons the service technician will often disconnect the AC power cord which detaches the equipment from ground. In order to safely install ESD sensitive products into the equipment, it is necessary to electrically connect or bond together the service technician, the equipment frame and the ESD sensitive product. Once bonded together an ESD event will NOT occur when the technician handles the product or installs it in the office equipment." [ESD Handbook ESD TR20.20-2008 section 5.1.3 Basic Grounding Requirements]
Why do people working on electronic equipment wear wrist straps that connect them to the equipment?
A: The reason is because as moving person you liable to generate kilo volts of static that when touching a circuit can and will destroy parts or worst unseen damage. The strap insure that no static can built because you are grounded to cause this kind of damage. In the industry it is mandatory if NASA has a project in the works. Get caught without it you are fired......
Why is ESD important in the manufacture of circuit boards?
If you do not take ESD precautions when working on a circuit board, or when working with electronic components or assemblies, there is a chance that static charge on your hands or on other places could discharge through one of the components and damage it. Damaging a component means the circuit or assembly or component no longer works correctly, or even worse, will operate normally but will experience a reduced lifetime, ie, fail in the near future.
How far apart should straps be place on flexible conduit?
you need to strap within 12" of box and not to exceed 4.5" there after
Is there a laptop bag with interchangable shoulder straps?
All laptop bags have clip-on should straps, and should be interchangeable between brands.
Why do people working on electronic equipment wear wrist straps?
To eliminate Static Electricity - Which can damage electrical equipment.
Should straps are effective at speeds of?
35 mph
What should you do with the head harness on your protective mask for long term storage that is more than 30 days?
Tuck all the straps inside the mask.tuck all the straps inside the maskTuck all the straps inside the maskTuck all the straps inside the mask
When should discard a PFD?
When is torn or has torn straps, discolored.
Can the straps show when wearing a thong?
Can they? Yes. Do they? Often. Should they? NO!
When should you discard a pfd?
When is torn or has torn straps, discolored.
Where can I buy ratchet straps?
You can buy ratchet straps at homedepot.com. They should have them and if you can't find them you can ask an employee for help. Here's their site: www.homedepot.com
How high should the straps be while wearing a thong?
Where they can't be seen.
Where should the breastplate on the restraint straps rest on the infant?
On the middle of the chest
How do you tighten bra straps?
there is normally a squre sliding thing on the bra straps if u slide that up and down to ur size that should hoopfuly tighten it
