HANDBOOK REQUIREMENTS - Central Maine Power Company

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B. CURRENT AND VOLTAGE TRANSFORMERS (CTs & VTs) Installations (except for "self-contained", paragraph 809) where the voltage of the incoming line is greater than 150 volts to ground (on a grounded line) or greater than 300 volts between conductors (on an ungrounded line) shall generally be arranged for metering with both CTs and VTs. NOTE: With prior Company approval, 277/480 volt, greater than 200 amp, four-wire wye services may be arranged for CTs only (no VTs) metering. Customers will not be allowed to connect any equipment to the metering terminals of instrument transformers. C. METER MOUNTING DEVICES (TRANSFORMER- RATED) The customer shall supply and install all meter mounting devices as required. Refer to the "Supplement" for meter mounting equipment requirements and options (see inside back cover of this handbook). All transformerrated meter mounting devices shall have provisions for mounting a test switch. Meter mounting devices shall be properly bonded and grounded, by the customer, in accordance with Section VII, “Grounding” and NEC Article 250. This generally requires connection to a grounding electrode with a grounding electrode conductor no smaller than No. 4, stranded copper. Additionally, there must be appropriate bonding to provide an effective ground-fault current path to the (voltage) source neutral. See Illustration No. 14, 15, 16 or 17 in Section XII for further details. 61
62 Meter mounting devices shall be located as near as possible to the instrument transformers at a location approved by the Company. They must not be located in vaults. Advance Company approval is required for any metering conduit runs in excess of 35 feet. In the case of primary metering, where the meter enclosure is to be mounted on a pole, the customer shall furnish and install at their own expense the 1 1/4 inch conduit between the instrument transformers on the pole and the meter mounting equipment. Where danger of plow or traffic damage exists, barriers consisting of concrete filled 6 inch IPS steel posts set a minimum of 48 inches deep must be installed for protection of the meter/meter mounting equipment. The posts shall be located so as not to interfere with the opening of doors/covers or restrict access to enclosures. 811. INSTRUMENT TRANSFORMER CABINETS For installations where the service voltage does not exceed 480 volts, cabinets for instrument transformers shall be furnished by the customer and be constructed and installed so as to meet the requirements of NEC Article 312. See Illustration No. 14 in Section XII for instrument transformer cabinet installation details. Cabinet size will be as specified by the Company. Refer to the "Supplement" for cabinet sizing requirements and options (see inside back cover of this handbook). All cabinets shall be constructed so that the cover can be readily opened. The cover shall be attached with hinges. The cabinet must be mounted so that the cover does not interfere with installation or maintenance work. For outdoor locations, cabinets shall be weatherproof or rain tight. 62
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HANDBOOK OF REQUIREMENTS FOR ELECTR
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To contact us for information or as
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CENTRAL MAINE POWER TOWNS SERVED TO
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TABLE OF CONTENTS I. INTRODUCTION 1
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501. Conductor Identification 502.
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XI. UTILIZATION EQUIPMENT SPECIFICA
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25. [364-9 & 364-10] Large 9’ x 9
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2 102. REVISIONS OF REQUIREMENTS Th
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4 II. General Requirements 200. APP
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6 Dwelling Application is used when
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8 be any duty or obligation on the
Page 25 and 26: 10 214. CUSTOMER'S RESPONSIBILITY 1
Page 27 and 28: 12 be provided with suitable automa
Page 29 and 30: 14 219. CUSTOMER CONSTRUCTED/OWNED
Page 31 and 32: 16 16 • Provide the Company a pla
Page 33 and 34: 18 III. STANDARD CHARACTERISTICS 30
Page 35 and 36: 20 20 service (whenever possible) f
Page 37 and 38: 22 22 304. TRANSFORMER VAULTS AND M
Page 39 and 40: 24 recommended to provide adequate
Page 41 and 42: 26 Refer to paragraph 219 for the r
Page 43 and 44: 28 Company requirements. Following
Page 45 and 46: 30 conductor to the neutral. Meteri
Page 47 and 48: 32 ith outlets used as mobile home
Page 49 and 50: 34 34 protection shall be installed
Page 51 and 52: 36 36 conductors must extend at lea
Page 53 and 54: 38 505. SERVICE MAST CONSTRUCTION U
Page 55 and 56: 40 40 of sufficient size to readily
Page 57 and 58: 42 42 double-throw switch or other
Page 59 and 60: 44 VII. GROUNDING AND BONDING 700.
Page 61 and 62: 46 2. Metal frame of building or st
Page 63 and 64: 48 electrode/conductor or metallic
Page 65 and 66: 50 building or structure grounding
Page 67 and 68: 52 test switches and control cable
Page 69 and 70: 54 54 804. POLE MOUNTED METERS Pole
Page 71 and 72: 56 56 identify the area served by e
Page 73 and 74: 58 58 “connected to the grounded
Page 75: 60 by-pass requirements and the res
Page 79 and 80: 64 64 not to interfere with the ope
Page 81 and 82: 66 66 The mounting of Company meter
Page 83 and 84: 68 68 901. CUSTOMER RESPONSIBILITY
Page 85 and 86: 70 acceptable to mount the riser(s)
Page 87 and 88: 72 72 The Company will make all con
Page 89 and 90: 74 other distribution system exists
Page 91 and 92: 76 76 In cases not meeting the prec
Page 93 and 94: 78 78 Primary service requiring hig
Page 95 and 96: 80 80 Section 321 B. During back-fi
Page 97 and 98: 82 82 Customers electing to install
Page 99 and 100: 84 84 determined (in consultation w
Page 101 and 102: 86 service only if it is built to C
Page 103 and 104: 88 X. SERVICE FROM UNDERGROUND MAIN
Page 105 and 106: 90 XI. UTILIZATION EQUIPMENT SPECIF
Page 107 and 108: 92 B. Overload protective devices s
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HANDBOOK REQUIREMENTS - Central Maine Power Company

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