SteveS0118
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We have a customer requesting us to use a motor that is listed by CSA to standard C22.2 No. 30 in a Class I, Division 1, Group D location in a wastewater plant. Would this standard be acceptable in the United States? Generally, we see them listed to the UL 1203 standard.
To go into some more detail, the motor is 4160V, 500HP, and will be run off a VFD with a 2:1 turndown. The customer originally requested us to use a non-inverter rated ATEX Ex d motor. After several weeks of going back and forth they accepted that the US does not recognize the European flameproof ATEX rating in a Class I, Div. 1 area. Now they have found a motor manufacturer that is willing to have CSA custom certify an ATEX motor for use in a Class I, Div. 1 environment for an extra $145,000. (Luckily this is a change order, so we are not on the hook.)
We suggested using a Class I, Div. 2 motor with a purge kit. It is our understanding that a motor shop would need to remove the nameplate when the purge kit is added. However, according to NEC 501.125 (A) (2) the purge kit would be acceptable since it would meet NFPA 496.
At the end of the day, our customer wants the nameplate to show Class I, Div. 1 (even if it is evaluated to a CSA standard instead of UL). We are trying to provide the most cost effective solution that meets the United States standards for our customer. Any guidance would be appreciated.
To go into some more detail, the motor is 4160V, 500HP, and will be run off a VFD with a 2:1 turndown. The customer originally requested us to use a non-inverter rated ATEX Ex d motor. After several weeks of going back and forth they accepted that the US does not recognize the European flameproof ATEX rating in a Class I, Div. 1 area. Now they have found a motor manufacturer that is willing to have CSA custom certify an ATEX motor for use in a Class I, Div. 1 environment for an extra $145,000. (Luckily this is a change order, so we are not on the hook.)
We suggested using a Class I, Div. 2 motor with a purge kit. It is our understanding that a motor shop would need to remove the nameplate when the purge kit is added. However, according to NEC 501.125 (A) (2) the purge kit would be acceptable since it would meet NFPA 496.
At the end of the day, our customer wants the nameplate to show Class I, Div. 1 (even if it is evaluated to a CSA standard instead of UL). We are trying to provide the most cost effective solution that meets the United States standards for our customer. Any guidance would be appreciated.